Question

A man in lift drop a coin and find that it never falls to the floor during course of motion. It means that lift is moving.

• A. Upwards with acceleration more than g
• B. Upwards with acceleration less than g
• C. Downwards with acceleration more than g
• D. Downwards with acceleration less than g

Answer 1

The correct option is C Downwards with acceleration more than g

Let the lift be accelerating with $g$,

Taking coin as system, in reference to lift.

Acceleration of coin wrt lift be $0$,

$mg-ma=m\times 0$

$\overrightarrow{a}=\overrightarrow{g}$

Hence acceleration of Lift is $g$ downwards.

Option $\text{C}$ is the correct answer