2 72% + A 45-kg cart slides down a slick but NOT frictionless roller-coaster track with a coefficient of kinetic friction of 0.056. At the end of the track, it reaches a level part of track and coasts to a stop after 12-m. If It started with a speed of 2.4 m/s at a height of 5.6 m, how much energy was lost to friction during the downhill part of the run? [Note uk is the same for ALL of the track] EXTRA CREDIT: Assuming the same ant id the final speed have been at the bottom of the hill if the