This motor has an efficiency 60 percentage At the instant sh

This motor has an efficiency 60 percentage. At the instant shown, the 50-kg block is being pulled at a constant speed of 5 m/s, which is increasing at the rate of 1 m/s^2. The kinetic coefficient of friction between the block and the horizontal surface is 0.25. What is the power input to the motor at this instant?

Solution

from the problem

power required=(_kxm gxv)+ma=(0.25x50x9.81x5)+(50x1)=663.125 W

power required for motor=(663.125)/efficiency=663.125/0.6=1105.2 W