A railway compartment is 16 m long, 2.4 in wide and 3.2 m h…

Physics Motion in a Straight Line Mix MCQ (Single Correct)

A railway compartment is 16 m long, 2.4 in wide and 3.2 m high. It is moving with a velocity v. A particle moving horizontally with a speed u, perpendicular to the direction of v, enters through a hole at an upper corner A and strikes the diagonally opposite corner B. Assume g= 10 m/s 2 .

v = 20m/s

u = m/s

To an observer inside the compartment path is parabolic.

To a stationary observer outside the compartment path is parabolic.`

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The correct answer is:

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Consider the vertical motion of the particle after entering compartment. Let it reach the floor in time t.

3.2 = (10)t 2 or t = 0.8 s

Due to the velocity component u, which remains constant, it covers a distance of 2.4 m is 0.8 s.

∴ ∴ u = 2.4 m/0.8 s = 3 m/s

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