A body of mass 2.0kg and which is rest is subjected to a force of 200N for 0.20 s followed by a force of 400 N for 0.30 s acting in the same direction. Calculate (a)The total impulse on the body and (b) the final speed of the body​

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.