A 2.00 kg block slides along a horizontal surface and is moving at 5.00 m/s just as it strikes a horizontally-mounted ideal spring (k = 100.N/m) that is fastened to a rigid wall on the other end of the spring. The spring first slows the car down to rest and then launches it back in the direction from which it came but with a speed of 3.00 m/s. Find the work done by friction in this process.