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  4. A man is standing on a spring platform. The reading of spring balance is 60 kg weight. If the man jumps outside from the platform, the reading of spring balance :

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Q. A man is standing on a spring platform. The reading of spring balance is $60 \,kg$ weight. If the man jumps outside from the platform, the reading of spring balance :

Haryana PMTHaryana PMT 2001

Solution:

First increases and then decreases to zero.
To jump off, the man exerts extra force on the springboard and hence the reading increases. But when the man leaves, the reading automatically decreases.