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Question

A 60 kg man stands on a spring scale in the lift. At some instant he finds, scale reading has changed from 60 kg to 50 kg for a while and then comes back to the original mark. What should we conclude


A

The lift was in constant motion upwards

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B

The lift was in constant motion downwards

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C

The lift while in constant motion upwards, is stopped suddenly

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D

The lift while in constant motion downwards, is suddenly stopped

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Solution

The correct option is C

The lift while in constant motion upwards, is stopped suddenly


For retarding motion of a lift R = m(g + a) for downward motion

R = m(g – a) for upward motion

Since the weight of the body decrease for a while and then comes back to original value it means the lift was moving upward and stops suddenly.

Note: Generally we use R = m(g + a) for downward motion

R = m(g – a) for upward motion

Here a = acceleration, but for the given problem a = retardation


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