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
B
1200N
C
1350N
D
1950N

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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