A 50.0 N box of clothes is pulled 6.6 m up a 30.0° ramp by a force of 116 N that points along the ramp. If the coefficient of kinetic friction between the box and the ramp is 0.22, calculate the change in the box's kinetic energy.
Change in kinetic energy = (116 N)(6.6 m)cos(30°) - (0.22)(50.0 N)(6.6 m)sin(30°)
Change in kinetic energy = 545.2 J