Linear Speed of cylinder

[irony416]

Homework Statement

Problem:

A solid cylinder of mass 3.0 kg and radius 0.2 m starts from rest at the top of a ramp, inclined 15 degrees, and rolls to the bottom without slipping. (I = 0.5MR^2). The upper end of the ramp is 1.2 m higher than the lower end. Find the lindear speed of the cylinder when it reaches the bottom of the ramp.

Homework Equations

Equations:
I = 0.5MR^2 = 0.6

The Attempt at a Solution

Do I use angular momentum here? Really have no idea. Thanks.

 

[Cyosis]

Use conservation of energy. What is the kinetic energy of a rigid body that both translates and rotates?