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Question

A parachutist with total weight $$75kg$$ drops vertically onto a sandy ground with a speed of $$2m{ s }^{ -1 }$$ and comes to a halt over a distance of $$0.25m$$. The average force from the ground on her is close to


A
600N
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B
1200N
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C
1350N
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D
1950N
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Solution

The correct option is B $$600N$$
Initial velocity while dropping on the ground u=2m/s.
Parachutist was brought to rest within s=0.25 m
Therefore retardation f : $$u^2=2fs; \; f=\frac{u^2}{2s}=8m/s^2$$
Averarage force from ground on her close is F=mf=600 N

Physics

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