a wagon of mass 42 kg is pushed by a student a distance of 12.2 meters, and 297 j of work was sone on the wagon how much force did the student apply assuming that it was constant

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.