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A person sits on a closed train moving at a constant speed. If the ball is...

A person sits on a closed train moving at a constant speed. If the ball is thrown up on its axes
(a), then where does the ball fall? What would your answer be if: (b) the cart accelerated?
(C) The cart slowed down?
(D) Does the cart move with a curve?
(E) I left the cart at a constant speed but opened on air?
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