08.48: A block of mass M on a horizontal surface is con
apzolm)3( rm .n1 gu.io8kll8nected to the end of a massless spring of spring constant k. The block is pulled a distance x from equilibrium and when released from rest, the block moves toward equilibrium. What
lg3i 8la.mon r18op(zmlk) u.minimum coefficient of kinetic friction between the surface and the block would prevent the block from returning to equilibrium with non-zero speed?