08.48: A block of mass M on a horizontal surface is connected to the
qv5zmez lh:-: 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 equilib
v zqm zhl:-e5:rium. What minimum coefficient of kinetic friction between the surface and the block would prevent the block from returning to equilibrium with non-zero speed?