Solve Prob. 14-70 if the coefficient of kinetic friction between the plane and the crate...

Solve Prob. 14-70 if the coefficient of kinetic friction between the plane and the crate is = 0.3.

Prob. 14-70:

The 50-kg crate is hoisted up the 30° incline by the pulley system and motor M. If the crate starts from rest and, by constant acceleration, attains a speed of 4 m/s after traveling 8 m along the plane, determine the power that must be supplied to the motor at the instant the crate has moved 8 m. Neglect friction along the plane. The motor has an efficiency of ? = 0.74.