Ep in this context means gravitational Ep near Earth's surface due gravitational field.:

Ep = mgh

Ek is the kinetic energy of moving molecules and for a large mass

Ek = 1/2 mv2

The Law of Conservation of Energy: total energy of the universe before and after something Happens must remain constant.

Epo + Eko = Epf + Ekf + Eh

A rock is dropped from height 15 m what speed has it at height 5.0 m (assume no air resistance)?

Ep, Ek, and the Law of Conservation of EnergyTuesday, December 06, 20111:40 PM

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Potential energies: there is no set zero value for potential energies, the truth is we cannot measure the exact Ep of anything. We can only measure if an object has a difference in Ep between two states.

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