Flywheel speed when hybrid car brakes to a stop

[bakoo]

Homework Statement

In a hybrid vehicle a flywheel is used to capture the energy of the car during braking. If the car has a total mass of 850kg and the flywheel has a mass-moment of inertia equal to 14kgm2 determine the speed of the flywheel when the car stops for traffic lights in an urban area (you may assume 100% efficiency).

Homework Equations

Not sure

I am thinking an equation for Uniform Angular Acceleration.

Or

Centripetal force

I am stuck on what one to use

The Attempt at a Solution

If i can get some hints, i would like to have a stab at this one, i am just 100% lost in Newtons laws and other equations...

 

[Dick]

Think of energy. The kinetic energy of the car has to turn into rotational kinetic energy of the flywheel.

 

[bakoo]

I will post what i have done in a few hours, thanks for the hint...

 

[zeuso]

Hi could you post your results or someone offer some help as i am having problems with the exact same question.

thank you