physics
posted by Anonymous .
a book on a shelf 2.0 meters above the floor has a mas of 1.5 kilograms. what is the gravitational potential energy of the book.

The gravitional potential energy is M*g*H , assuming zero energy is defined as the value at the floor.
g is the acceleration of gravity, 9.8 m/s^2, which you should already be familiar with.
All you have to do is multiply those three numbers. The answer will have units of Joules.