A 60 kg man leaps vertically from a crou...

A 60 kg man leaps vertically from a crouching position when his centre of mass is 40 cm above the ground. As his feet leave the floor his centre of mass is 90 cm above the ground and rises to 120 cm at the top of his leap. Calculate up upward froce, assumed constant, that the ground exerts on the man.
[Hint : Human body is a system of particles]

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The correct Answer is:

96 kgf

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