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A parachute o...

Question

A parachute of weight $w$ strikes the ground with his legs fixed and comes to rest with an upward acceleration of magnitude $3 g$ . Force exerted on him by ground during landing is :

A

4 w

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B

3 w

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C

2 w

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D

w

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Solution

The correct option is A $4 w$
According to Newton's 3rd law, the force exerted on the man by the ground and the force exerted on the ground by the man is equal and opposite.
so from FBD, $F = 3 m g + w = 3 w + w = 4 w$ (Here, $w = m g$ )

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