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Question

A parachutist with total weight 75kg drops vertically onto a sandy ground with a speed of 2ms1 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 : u2=2fs;f=u22s=8m/s2
Averarage force from ground on her close is F=mf=600 N

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