How Do You Calculate Gravitational Potential Energy on an Inclined Plane?

[dance_sg]

Homework Statement

A 50.0 kg carton is dragged up a low-friction plank onto the back of the truck. The length of the plank is 3.00 m and it makes an angle of 15.0º with the ground. With respect to the bottom of the plank, the gravitational potential energy of the carton on the truck is

Homework Equations

ep=mgh

The Attempt at a Solution

im not sure what i have to do with the 15 degrees in order for me to solve the equation.

 

[kuruman]

Use the angle to find the change in height of the block. A block moving up a 30^o ramp of fixed length (3.0 m) rises higher vertically than if the angle is 15^o.