Circular Motion Problem: Solving for Revolutions with Constant Acceleration

[mjolnir80]

Homework Statement

if you step on your car's breaks hard, the wheels stop turning after 1.0 revolution. At the same constant acceleration , how many revolutions do the wheels make before stopping if you initial speed is twice as high?

Homework Equations

The Attempt at a Solution

im having trouble deciding which equations i should use...

and also is the initial speed(referred to in the problem statement) the angular speed or the tangential speed?
thanks in advance

 

[mjolnir80]

anyone?

 

[alphysicist]

Hi mjolnir80,

Homework Statement

if you step on your car's breaks hard, the wheels stop turning after 1.0 revolution. At the same constant acceleration , how many revolutions do the wheels make before stopping if you initial speed is twice as high?

Homework Equations

The Attempt at a Solution

im having trouble deciding which equations i should use...

and also is the initial speed(referred to in the problem statement) the angular speed or the tangential speed?
thanks in advance

I believe they are referring the the linear speed of the car (which is closely related to the angular speed of the wheels' rotation).

For the equations, in the problem they mention constant acceleration and initial and final speeds, and revolutions. How can those quantities be related?