Posted by **Chan** on Saturday, November 14, 2009 at 4:26am.

Hi!Need help please.

Question:A car initially traveling at 24.0 m/s undergoes a constant negative acceleration of magnitude 2.10 m/s2 after its brakes are applied.

(a) How many revolutions does each tire make before the car comes to a stop, assuming the car does not skid and the tires have radii of 0.330 m?

____ rev

(b) What is the angular speed of the wheels when the car has traveled half the total distance?

___ rad/s

- physic -
**bobpursley**, Saturday, November 14, 2009 at 7:13am
You know the velocity intial, the final veloctiy, and are looking for distance

Vf^2=vi^2 + 2ad

solve for d.

Then convert that to revolutions.

the average angular velocity is average velocity/circumference

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