Rotational motion (flywheel) problem

[N_L_]

Any ideas on how to approach / set up the following problem?

http://img124.imageshack.us/img124/9707/untitled8vv.jpg (http://imageshack.us)

[Hootenanny]

The question is bascially asking how much energy is required to travel 350km, with a frictional force of 450N while acclerating from 0 to 95km/h twenty times. You know that all the energy will be 'stored' as rotational kinetic energy and will be converted to work done at the end of the trip.

-Hoot:smile:

[N_L_]

Thank you.