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