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## Homework Statement

The driver of a car is travelling on a wet, level road, and slams on the brakes. The car slides 88M to a stop, with a coefficient of friction of 0.42. What was the initial speed of the car?

## Homework Equations

KE = .5mv

^{2}

Δd = v

_{1}Δt + .5aΔt

^{2}

Any other kinematics, dynamics, and work/energy/power equations.

## The Attempt at a Solution

I have tried subbing equations together but I always end up with 3 variables, v

_{1}, a, and Δt. I feel like mass is required for any solution, because then friction could be calculated and the rest would be simple.