physics
posted by physics .
the maximum height a typical person can jump from a crouched start is about 60cm. By how much does the gravitational potential energy increase for a 72kg person in such a jump? Where does this energy come from?
I know the formula for gravitational potential energy is U=mgh. I just don't know what to plug in =/

72 * 9.81 * 0.60 in Joules
It comes from the kinetic energy at liftoff 
prove the law of conservation of energy in the case of a sliding body?

1. Given: m=72 kg; g (constant)=9.8 m/s^2; h= 60cm= .60m
2. Use the gravitational potential energy formula: U=mgh.
3. solve:
U=mgh
U=(72 kg)(9.8 m/s^2)(.60m)
U=423.36 kg m/s^2