- #1

RebelAngel

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## Homework Statement

A 1500 kg automobile travels at a speed of 110 km/h along a straight concrete highway. Faced with an emergency situation, the driver jams on the brakes and slides to a stop.

a) What is his stopping distance on dry pavement (mu = 0.85)?

b) What is his stopping distance on wet pavement (mu = 0.60)?

## Homework Equations

My instructor gave me this equation to use to solve the problem:

-µF

_{N}=ma

_{x}

## The Attempt at a Solution

I first converted km/h to m/s which came out to be 0.533.

I then plugged my numbers into the formula:

-0.85F

_{N}=1500(0.533)

and came out with this answer:

F

_{N}= -940.6 for a

and

F

_{N}= -1332.5 for b

Im not sure where I messed up, but if anyone could help me that would be great!

Thanks!