posted by junior on .
an initially stationary 15.0 kg crate of cheese wheels is pulled via a cable a distance d = 5.70 m up a frictionless ramp to a height of h = 2.5 m, where it stops. What is its potential energy of the crate after it is lifted? how much work is done during the lift? If it takes 10 seconds to lift the cheese, what is the power rating of the lifting device?
If the ramp is frictionless, the work done equals the potential energy change, P.E. = W = M g h.
The distance d doesn't matter.
Divide that work by 10 seconds for the power rating in watts.