Calculating Energy Transfer for 75kg Boy Sliding Down Hill

[phys1618]

Homework Statement

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

Homework Equations

d=(vf2-vi2)/2a
KE=1/2Mv2
change of ENERGYsystem=constant
PEi +KEi=PEf + KEf
PE=Mgh

The Attempt at a Solution

I have no clue to figure this out...please help by explaining the steps..Many thanks!

 

[LowlyPion]

Homework Statement

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

Homework Equations

d=(vf2-vi2)/2a
KE=1/2Mv2
change of ENERGYsystem=constant
PEi +KEi=PEf + KEf
PE=Mgh

The Attempt at a Solution

I have no clue to figure this out...please help by explaining the steps..Many thanks!

Figure what his PE was. Then figure what his KE is at the bottom. The difference went into warming his behind.