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A particle is projected from corner P of an elevator moving downwards with acceleration a, towards diagonally opposite corner R. Then

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particle will hit the roof RS if a < g.

particle will hit the wall QR if a > g

data insufficient

particle will hit R only when a = g

answer is A.

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Detailed Solution

Once the body is projected, the acceleration of the body will be ‘g’.

If a>g the lift will have more vertical displacement than the projected body, so it will hit the roof.

if a<g the lift will have less vertical displacement than the projected body, so it will hit the wall.

if a=g the vertical displacement of the lift and the projected body will be same, so it will hit the lift exactly at R.

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