Question

A block is kept on the floor of an elevator at rest elevator starts descending with an acceleration of 12 m per second square

Answer 1

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Answer 2

Answer:

Acceleration should be 12m/s^2. If such and block is not bound to be with the elevator then it will go down with acceleration of 'g'. Then displacement in first 0.2s will be

s=1/2gt^2 (taking u=0).

Substitute

S=0.2 m = 20 cm

Hope it helps