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A 60kg man stands on a spring scales in ...

A 60kg man stands on a spring scales in a lift. At some instant. He finds that the scale reading has changed from 60kg to 50 kg for a while and then comes back to original mark. What should be concluded?

A

The lift was in constant motion upward.

B

The lift was in constant motion downward.

C

The lift while in motion downward suddenly stopped.

D

The lift while in motion upward suddenly stopped.

Text Solution

Verified by Experts

The correct Answer is:
D
The reading of the spring scale is the normal reacton between man and spring scale.
As the reading is decreasing, it means normal reaction is decreasing. Firslty, the lift must be moving upwards with constant velocity and decelerated to rest.
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