User A 1.0 kg box is launched from rest by a compressed horizontal spring as shown in the figure below. The spring has a constant k = 500.0 N/m and is compressed by 30.0 cm. The block slides on a track down a hill and comes to rest at a distance d from the base of the hill. Kinetic friction between the box and the track is negligible on the hill, but there is a coefficient of kinetic friction of 0.60 between the box and the lower horizontal part of the track. The block remains on the track at all times. How much energy does the block have after it's come to rest at the end of the track? How much work is done on the block by friction?

30.0 cm- 1.80 m 40 |+ d =