1. The problem statement, all variables and given/known data 75 kg boy, starting from rest, slides down a 30 degrees hill htat is 70 m long. He arrives a thet bottom with a speed of 15 m/s. How much thermal energy has been shared btwn the surface of the hill and the seal of his pants 2. Relevant equations d=(vf2-vi2)/2a KE=1/2Mv2 change of ENERGYsystem=constant PEi +KEi=PEf + KEf PE=Mgh 3. The attempt at a solution I have no clue to figure this out....please help by explaining the steps..Many thanks!