Question

An electric motor is rated to have a maximum power output of 0.72 hp. If this motor is being used to lift a crate of mass 188 kg, how fast (i.e., at what speed) can it lift the crate? Hint: Assume the only other force on the crate is the force of gravity.

Answer 1

0.72 hp =536.9 W
P = m•g•v
v =P/mg = 536.9/188•9.8 =0.29 m/s.