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Determine the speed of the car from the length of skid mark

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1. After an accident, how do police determine the speed at which the car had been traveling?
The formula r = 2 sqrt(5L) can be used to approximate the speed r, in miles per hour, of a car that has left a skid mark of length L, in feet.
How far will a car skid at 65mph? at 100 mph?

2. simplify the radical expression

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It shows detailed steps of calculation of the speed of the car from the length of skid mark by solving a radical equation.

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