The Force Exerted by the Ground on a Parachuter

[proace360]

Homework Statement

A 35.5 kg parachutist lands moving straight downward with a speed of 3.85 m/s.
(a) If the parachutist comes to rest with constant acceleration over a distance of 0.700 m, what force does the ground exerts on her?

Variables: Vo, Vf, F, m, a, x
Known: Vo=3.85 (I think the problem means this as the initial)
m=35.5 kg
Vf=0 (don't quite understand the problem)
x=.7 m

Homework Equations

Fnet=m*anet
Possibly Vf^2=Vo^2+2ax

The Attempt at a Solution

I used Vf^2=Vo^2+2ax, and I got 10.5875 m/s^2, multiplied that by 35.5 kg, and I got 375.86 N. WebAssign says the answer is wrong.

 

[proace360]

I figured it out. Apparently that is just the force required to stop the object--you must also factor in the weight.