Q.

A stone is just dropped from the window of a train moving along a horizontal straight track with uniform speed. The path of the stone is

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a

A parabola for an observer standing by the side of the track

b

A horizontal straight line for an observer inside the train

c

both of the above are true

d

none of the above is true

answer is A.

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Detailed Solution

For an observer on the ground , initial horizontal component of velocity of the stone is equal to the velocity of the train and initial vertical component of velocity of the stone is zero.Therefore the situation is equivalent to horizontal projection from a height and the trajectory is a parabola.
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A stone is just dropped from the window of a train moving along a horizontal straight track with uniform speed. The path of the stone is