Compare the power of two electric motors that both lift a box with a mass of 5kg, 2m in the air on earth. the first motor does this 5 seconds and the second motor does this in 8 seconds. show your workings. include the units.

Two masses are connected by a rope that hangs over a pulley as shown below. the pulley is a uniform cylinder of radius 푅=0.381meters and mass 푀=3.1푘푔. initially 푚"is on the ground and 푚#rests 2.5 meters above the ground. if the system is released, use conservation of energy to determine the speed of 푚#just before it strikes the ground. assume the pulley bearing is frictionless.