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Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি

Car A starts from rest at t=0 and travels along a straight road with a constant acceleration of 6ms-2 until it reaches a speed of 80m/s. Afterwards it maintains this speed. In contrast, at t=0, car B located 600m down the road is traveling towards A at a constant speed of 60 m/s. Find the distance traveled by car A when they pass each other.

2400m

3400m

2800m

3200m

IUT2016সুষম ত্বরণের গতিসূত্রউচ্চতর গণিত দ্বিতীয় পত্রসমতলে বস্তুকণার গতি