A block of mass M = 1.5 kg slides between two springs, of spring constant kleft = 30 N/m and kright = 57 N/m. The distance between the relaxed springs is d = 2.8 m. The left spring is initially compressed a maximum of dleft = 0.7 m, and the block is released from rest. The first time the block hits the right spring, it compresses it a distance dright = 0.4 m
Find the coefficient of sliding friction between the block and the surface.