A sled with a daring rider has a combined mass of 150 kg. The sled and rider have an ini;al speed of 22.5 m/s on an icy horizontal surface at ground level and then travel over a smooth, icy 11 m high hill to a cliff, travel on an icy horizontal surface at the top of the cliff, and then go over the cliff to travel back to the ground. Find the speed just before the sled and rider leave the cliff.