# Kinetic Energy rotational motion problem, help please

1. Dec 4, 2008

### tonedog12345

Kinetic Energy rotational motion problem, help please!!

1. The problem statement, all variables and given/known data

A 2.4 kg cylinder (radius = 0.11 m, length = 0.50 m) is released from rest at the top of a ramp and allowed to roll without slipping. The ramp is 0.62 m high and 5.0 m long.

(a) When the cylinder reaches the bottom of the ramp, what is its total kinetic energy?
(b) What is its rotational kinetic energy?
(c) What is its translational kinetic energy?

2. Relevant equations

klinear = 1/2mv^2
krotation = 1/2Iw^2

3. The attempt at a solution

tried plugging in 2.4 for mass but have no clue how to get the speed, when its not given.

2. Dec 4, 2008

### Hootenanny

Staff Emeritus
Re: Kinetic Energy rotational motion problem, help please!!

HINT: Something is conserved.

3. Dec 4, 2008

### tonedog12345

Re: Kinetic Energy rotational motion problem, help please!!

ummm that really doesn't help me..

4. Dec 4, 2008

### Hootenanny

Staff Emeritus
Re: Kinetic Energy rotational motion problem, help please!!

Which quantity do you think is conserved?