An electric winch with an efficiency of 75% is used to raise a load of mass 80 kg vertically at a constant speed of 1.5 m s-1.
Taking the acceleration due to gravity as g=9.8 m s−2g = 9.8\text{ m s}^{-2}g=9.8 m s−2, calculate the electrical input power of the winch.
882 W882\text{ W}882 W
1176 W1176\text{ W}1176 W
1568 W1568\text{ W}1568 W
160 W160\text{ W}160 W