A 10.0-kg block is released from rest at point in the figure below. The track is

Question

A 10.0-kg block is released from rest at point in the figure below. The track is frictionless except for the portion between points and , which has a length of 6.00 m. The block travels down the track, hits a spring of force constant 2 100 N/m, and compresses the spring 0.250 m from its equilibrium position before coming to rest momentarily. Determine the coefficient of kinetic friction between the block and the rough surface between points and .Think carefully about what terms correspond to the initial mechanical energy and the final mechanical energy and how they are related to the change in internal energy of the system due to the friction force.

Explanation / Answer

initial m.e = mgh

work done by friction = mg*6

energy stored in spring = 1/2*k*x^2

so = 0.39

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