Suppose a 225 kg motorcycle is heading toward a hill at a speed of 31 m/s. The two wheels weigh 12 kg each and are each annular rings with an inner radius of 0.280 m and an outer radius of 0.330 m. (a) How high can it coast up the hill, if you neglect friction in m? m= 195 kg v= 29 m/s h= 39 m
(b) How much energy is lost to friction if the motorcycle only gains an altitude of 39 m before coming to rest?

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.