$2-)$ A $10\mathrm{.}0-$kg block is released from rest at point A$.$ The track is frictionless except for the portion between points B and C $,$ which has a length of $6\mathrm{.}00$ m $.$ The block travels down the track, hits a spring of force constant $2250\frac{N}{m},$ and compresses the spring $0\mathrm{.}300$ 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 B and C$.$