- #1

- 37

- 0

## Homework Statement

A car is traveling at 48.0 km/h on a flat highway.

(a) If the coefficient of friction between road and tires on a rainy day is 0.100, what is the minimum distance in which the car will stop?

(b) What is the stopping distance when the surface is dry and the coefficient of friction is 0.600?

## Homework Equations

F = ma

Ff = u*Fn

kinematics equations

## The Attempt at a Solution

I attempted to get the F in F = ma to equal the friction equation because friction is the only force acting on the car.

so i got:

F = Ff

ma = μ*Fn

ma = μ*m*g

a = μ*g

a = .1*-9.8

a = -.98

Vf^2 = Vi^2 + 2aX

0 = 48^2 + 2(-.98)(X)

-2304 = -1.96 (X)

1175.5 = X

But this isn't correct... So i was hoping someone would be able to show me the error of my ways so i could fix part a and do part b