How Much Work Does Friction Do on a Skateboarder Descending a Ramp?

[Jtappan]

Homework Statement

Jim rides his skateboard down a ramp that is in the shape of a quarter circle with a radius of 6.50 m. At the bottom of the ramp, Jim is moving at 2.82 m/s. Jim and his skateboard have a mass of 67.0 kg. How much work is done by friction as the skateboard goes down the ramp?
__________ J

Homework Equations

w=f*d

The Attempt at a Solution

Is this sort of a angular velocity problem? I don't even know how to set this one up

 

[Jtappan]

disregard this post...sorry i posted it twice

 

[mdk31]

You could try conservation of energy:

K + U + W[nonconservative forces] = K[f] + U[f]

Where the work done by nonconservative forces is the force of friction times the distance.