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Acceleration in 2D

A boy is stan...

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A boy is standing on a plank which is accelerating vertically upwards with constant acceleration. If boy throws a ball vertically up with velocity v relative to plank and its time of flight is T, the acceleration of the plank, is (1) a= 2v+gT T (3) v-gT (2) a= Vo+gT T 2v-gT

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