Sarah was attempting to pull the cart seen here through point a in the diagram. she could not do it. her sister suggested setting up a pulley system to sarah with the task. the girls added the pulleys and ropes you see here. how did this pulley system sarah move the cart?

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.