A 1.7 kg box is on a frictionless θ = 37° slope and is connected via a massless string over a pulley of mass M = 1.3 kg and radius R = 0.64 m to a hanging 8.5 kg weight. The coefficient of kinetic friction between the ramp and the box is 0.19. The boxes are released from rest.
Calculate the work done on the box by kinetic friction as the weight drops by a distance of 1.1 meters.
Use conservation of energy to find the speed of the boxes when the weight has dropped by 1.1 meters.