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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

both of the above are true

b

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

c

a horizontal straight line for an observer inside the train

d

none of the above is true

answer is A.

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Detailed Solution

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For observer on the ground, the stone will have initial velocity equal to the velocity of the train in horizontal direction. So, the stone will move as horizontal projection following a parabolic path.

For observer in the train, initial horizontal velocity of the stone is zero, so, it seems to fall in vertically downward direction.

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