Question

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

• A. $w$
• B. $2w$
• C. $3w$
• D. $4w$

Answer 1

The correct option is D $4w$

The parachutist goes upward with an acceleration $3g$ and his weight is $w$.
Therefore,
$w=mg$
$N-mg=m\left(3g\right)\Rightarrow N=4mg=4w$.