Answers (cont.)
n 2.) To find the force will use
Fs=kx, but since you only know
“x” you must find “k” also
n Use PEs=1/2kx2 to find “k”
n PEs=100J=1/2k(0.1m)2
n k=20 000N/m
n use Fs=kx=20 000N/m x 0.1m
n Fs=2000N