Imagine a cart sitting at the top of a hill. The cart then rolls down the hill until it reaches the bottom.
Ignoring friction, which of the following must be TRUE?
a
When it is sitting still at the top of the hill, all of its energy is potential energy.
b
At the bottom of the hill, all of its potential energy has been converted to kinetic energy.
c
As it rolls down the hill, the combination of its kinetic and potential energy must equal the amount of potential energy with which it started.
d
Total energy = Kinetic Energy + Potential Energy
e
All of the above