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I have honestly been trying to figure this problem out for over an hour now, and every time I try to solve for KE, I get a ridiculously high number.

A race car having a mass of 1000 kg was traveling at high speed on a wet concrete road under foggy conditions. The tires on the vehicle later were measured to have µ = 0.55 on that road surface. Before colliding with the guardrail, the driver locked the brakes and skidded 100 m, leaving visible marks on the road. The driver claimed not to have been exceeding 65 miles per hour (29 m/s). Use the equation W=KE to estimate the driver's speed upon hitting the brakes.

W=KE

KE=(mv^2)/2

Every time I try to substitute and solve for KE, I'm getting a workload of over 300,000 N for the brakes, obviously impossible.

## Homework Statement

A race car having a mass of 1000 kg was traveling at high speed on a wet concrete road under foggy conditions. The tires on the vehicle later were measured to have µ = 0.55 on that road surface. Before colliding with the guardrail, the driver locked the brakes and skidded 100 m, leaving visible marks on the road. The driver claimed not to have been exceeding 65 miles per hour (29 m/s). Use the equation W=KE to estimate the driver's speed upon hitting the brakes.

## Homework Equations

W=KE

KE=(mv^2)/2

## The Attempt at a Solution

Every time I try to substitute and solve for KE, I'm getting a workload of over 300,000 N for the brakes, obviously impossible.

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