A kid sits in a sled on a horizontal snowy surface. The combined mass of the kid and the sled is 34 kilogram. The kinetic coefficient of friction is 0.39. Initially the kid and her sled are at rest. After you pull the sled 20 meter the velocity of the sled is 1.5 meter per second. Find how much total mechanical work (J) did you do as you pulled the sled and kid 20 meter?