(a) A \( 15.0 \mathrm{~kg} \) block is released from rest at point \( \mathrm{A} \) in the figure below. The track is frictionless except for the portion between points B and \( \mathrm{C} \), which has a length of \( 6.00 \mathrm{~m} \). The block travels down the track, hits a spring of force constant \( 2,150 \mathrm{~N} / \mathrm{m} \), and compresses the spring \( 0.250 \mathrm{~m} \) from its equilibrium position before coming to rest momentarily. Determine the coefficient of kinetic friction between the block and the rough surface between points \( \mathrm{B} \) and \( \mathrm{C} \).
(1)