Answers
n
1.) Using PE
s
=1/2kx
2
you
know “x” but not “k”
n
You can find “k” using F
s
=kx
n
With F
s
equal to the weight of
the hanging mass
n
So… F
s
=F
g
=mg=2kgx9.81m/s
2
n
F
s
=19.62N=kx=k x 0.25m
n
k=78.48N/m
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