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## Homework Statement

Car is driving up the hill with speed of 60 km/h. Angle of incline is 17°. Seeing barrier on the road, the driver suddenly stops (breaks the wheels) and starts to slide. If koef. of fiction is [tex]\mu[/tex]=0.6 what is the distance between breaking point and the point when cars stops. Solve the problem with the same parameters when the car is driving down the hill.

(I hope you understand the question, it is a little difficult for me to translate it...)

## Homework Equations

Again, I solve it but I'm not sure if is correct..

## The Attempt at a Solution

Uphill:

Ek = Ep + Fk*s

1/2 mv^2 = mgh + [tex]\mu[/tex]*m*g*cos([tex]\alpha[/tex])*s

(h = s * sin([tex]\alpha[/tex]))

...

s = 32,7 m

Downhill:

Ek + Ep = Fk*s