A) force acting on it at that instant
B) acceleration of the train
C) Both [a] & [b]
D) None of these
Correct Answer: A
Solution :
[a] Since force at a point at any instant is related to the acceleration at that point, at that instant and acceleration is determined only by the instantaneous force and not by any history of the motion of the particle. Therefore, the moment the stone is thrown out of an accelerated train, it has no horizontal force and acceleration, if air resistance is neglected.
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