Conservation of momentum and velocity question

[affordable]

Homework Statement

The 1000N stone box is supported by
two steel cylinders A and B at 100N each. The system is at rest
in the position shown when the constant
force P = 100N is applied.

Determine the velocity of the stone box C when cylinder A
has reached the left corner of the box.

http://img801.imageshack.us/i/unledom.jpg/

Homework Equations

The Attempt at a Solution

Ugh. It logged me out, so my explanation will be pretty weak.

What I did was use the circumference of a circle as 20/(30pi) as the distance needed to get the cylinder to the end. I used F=ma to find the acceleration of the box in the x direction is 1/10 in/sec^2.

From here, I'm unsure. I assume that this is a momentum problem that transfers energy to the cylinders, but I'm not for sure which formula to use.

I'm thinking about using total work-.5mv^2+.5*I*(omega)^2.

Would the acceleration in the x direction be equal for the cylinders and the box?

 

[tiny-tim]

hi affordable!

(have an omega: ω and try using the X² icon just above the Reply box )

Would the acceleration in the x direction be equal for the cylinders and the box?

nooo …

what are the speeds of the top middle and bottom of the cylinder?

I'm thinking about using total work-.5mv^2+.5*I*(omega)^2.

that's the one!

now plug in a formula relating v and ω, and solve