Answer-A person standing on a trolley moving in a straight line throws a stone vertically upward, relative...

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When the person throws the stone vertically upward relative to himself , it means the stone initially has both a vertical velocity from the throw and a horizontal velocity equal to that of the trolley since both the person and the stone were moving with the trolley before the throw.  If the trolley moves with uniform velocity , there is no horizontal acceleration , so the stone maintains its horizontal motion and follows a vertical path relative to the person , landing back in his hand. However, if the trolley is accelerating forward , the stoneonce releasedis no longer in contact with the trolley and does not accelerate with it. So the trolley moves ahead during the stones flight, and the stone appears to fall behind the thrower.  Thus, the correct conclusion is  The stone will return to his hand only if the trolley moves at a uniform velocity.

A person standing on a trolley moving in a straight line throws a stone vertically upward, relative to himself, while facing in the direction of motion. Which of the following is true?

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