Question

A man is standing at a spring platform. Reading of spring balance is $60kg.wt$. If man jumps outside platform, then reading of spring balance:

• A. first increases then decreases to zero
• B. decreases
• C. increases
• D. remains same

Answer 1

Answer: (A)

first increases then decreases to zero

The man can jump by exerting force on the machine and in return he gets pushed up because of the equal and opposite force by machine so the force exerted by man to jump adds up with the initial force i.e his weight reading first goes up and then down.