Same Question as before.

[MissFortune]

This was the original question: A high jumper falling a 3.9 m/s, lands on a foam pit and comes to rest, compressing the pit a distance of 0.43 m. If the pit is able to exert an average fource of -1100 N on the high jumper in breaking the fall, what is the jumper's mass?
But Im not sure if Im supposed to multiply or divide 0.43m and 3.9 m/s
Ive narrowed the answer down to either 1845 kg or 121 kg.

[whozum]

Ive narrowed the answer down to either 1845 kg or 121 kg.

Well, 1845kg is about 4000lbs.. whereas 121kg is about 260lbs..

[MissFortune]

Ive been leaning towards 121kg mainly because of that, but I just wanted to be sure.

[whozum]

Show your work and I can look over it.

[Doc Al]

But Im not sure if Im supposed to multiply or divide 0.43m and 3.9 m/s
Ive narrowed the answer down to either 1845 kg or 121 kg.
Sounds like you're guessing? :grumpy:

(1) What's the acceleration?
(2) Apply Newton's 2nd law to find the mass. (Use the net force.)