. A 10 kg block, with an initial velocity of 7 m/s in the positive x-direction, is connected to an ideal unstretched spring with the constant of 2.5 N/cm whose other end is attached to the wall. The coefficient of the kinetic friction between the block and the horizontal surface is 0.25. (b) Find the new stopping position, i.e. for the case with friction. (c) How much mechanical energy was dissipated in part (b)?

(d) What is the magnitude of velocity at the original point?

Please solve c and d

the answers are c)30.5 and d)6.07