Homework Answers
using hooke's law
F = kx
k = F/x
using conservation of energy
spring energy = fricitonal energy loss
0.5 k x^2 = u m g x
0.5 F/x * x^2 = u mg x
0.5 F = u mg
u = F / (2 mg)
========
Comment in case any doubt, will reply for sure.. Goodluck
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