1. The problem statement, all variables and given/known data A sled and rider with a combined mass of 55 kg are at the top of a hill a height of 20 m above the level ground below. The sled is given a push providing an initial kinetic energy at the top of the hill of 1950 J. (c) If friction can be ignored, what will be the kinetic energy of the sled and rider be at the bottom of the hill? 2. Relevant equations k = 1/2 m v (squared) 3. The attempt at a solution 1/5 x 55 x 20 (squared) = 11,000 But its wrong!