A) If we drop a 10Ib iron ball and 1Ib aluminium ball from the top of a high platform inside a mine, then both will reach the floor at the same time.
B) The gravitational force of attraction between the two bodies increases when their masses are increased and distance is reduced.
C) We do not observe small objects moving towards each other because frictional force balances the gravitational pull.
D) When a body is thrown up, the acceleration due to gravity at the topmost point is zero because velocity of the body is zero.
Correct Answer: D
Solution :
The acceleration due to gravity is always directed downwards towards the centre of the Earth for a freely falling body.
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