friction problem

ksle82

A car travelling at an initial velocity [tex]v_{0}[/tex] applies its brakes to come to a stop. The coeffictien of friction is [tex]\mu[/tex]. What distance is required to stop?

I know that you can solve for x using this equation:
[tex]v^2=v_{0}^2+2ax[/tex]

-but i don't know how to solve for acceleration a. any help?

Office_Shredder

Can you calculate the frictional force? If so, can you calculate the acceleration, by, say, using the definition of force? Try it out, assigning the mass to be m₀, and see what you get

ksle82

Im trying to do a force balace to find a but im not sure this is right.

[tex]-\mum_{0}g=m_{0}a[/tex]
solving for for a, i get [tex]a=\mug[/tex]

ksle82

excuse my bad Latex

but it should be:

-u*Mo*g=Mo*a, solving for a,

a=-u*g

daniel_i_l

yes thats right!

ksle82

thanx 'preciate the help