Answers
n 1.) Using PEs=1/2kx2  you
know “x” but not “k”
n You can find “k” using Fs=kx
n With Fs equal to the weight of
the hanging mass
n So… Fs=Fg=mg=2kgx9.81m/s2
n Fs=19.62N=kx=k x 0.25m
n k=78.48N/m
n More…