Energy and pulleys (Atwood's machine i think)

[pat666]

Homework Statement

The pulley in the diagram has a radius of 0.160 m and a moment of inertia 0.480 kg.m². The rope does not slip on the pulley rim. Use energy methods to calculate the speed of the 4.00 kg block just before it strikes the floor.

Homework Equations

The Attempt at a Solution

ok so I've already had a lot of help from physics-forums on this and thanks to that I've solved it. I got a value of 3.182m/s could someone please check this.

 

[darkchild]

This can't be worked from the information given; the diagram would be helpful.

 

[pat666]

sorry here it is