A sled and rider with a combined mass of 50 kg are at the top of a hill 20 m above the level of ground below. The sled is given a push providing an initial kinetic energy at the top of the hill of 1050 J.

(a) Choosing a reference level at the bottom of the hill, what is the potential energy of the sled and rider at the top of the hill?

J

(b) After the push, what is the total mechanical energy of the sled and rider at the top of the hill?

J

(c) If friction can be ignored, what will the kinetic energy of the sled and rider be at the bottom of the hill?

J