64. A block of mass 500 g is attached to a spring of spring constant 80 N/m (see the following figure). The other end of the spring is attached to a support while the mass rests on a rough surface with a coefficient of friction of 0.20 that is inclined at angleof 30. The block is pushed along the surface till the spring compresses by 10 cm and is then released from rest. (a) How.r much potential energy was stored in the blockspringsupport system when the block was just released? 0:) Determine the speed of the block when it crosses the point when the spring is neither compressed nor stretched. (o) Determine the position of the block where it just comes to rest on its way up the incline