Jay fills a wagon with sand (about 20 kg) and pulls it with a rope 40 m along the beach. he holds the rope 25â above the horizontal. the rope exerts a 20-n tension force on the wagon. how much work does the rope do on the wagon?

Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.