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## Homework Statement

in an emergency stop on a level dry concrete road the magnitude of the friction force when sliding is approx 80% of the weight of the vehicle. What stopping distance is required for a vehicle travelling at 88km/h (24.444 m.s)?

Assume that all the wheels lock when the brakes are applied

Use 9.8 m/s2 for gravitational acceleration

## Homework Equations

W= F*X

.5mvE2

SumF = ma

## The Attempt at a Solution

I have tried a number of combinations using the above equations - I can't figure this out.

Help anyone!