SOLUTION: . After an accident, how do police determine the speed at which the car had been traveling? The formula r=2 square root 5L can be used to approximate the speed r, in miles per ho
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Question 306912: . After an accident, how do police determine the speed at which the car had been traveling? The formula r=2 square root 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.
a) Solve this equation for L. Describe your steps.
b) How far will a person skid if they are driving 55mph? 100mph?
c) The skid mark at an accident scene was 217.8 feet long. How fast was the person travelling? Do you suppose that they were speeding? Explain why or why not.
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
Square both sides
\ =\ \frac{r^2}{20})
=======================
\ =\ \frac{55^2}{20})
\ =\ \frac{100^2}{20})
You get to do your own arithmetic.
=======================
\ =\ 2\sqrt{5L})
\ =\ 2\sqrt{5\cdot217.8})
You get to do your own arithmetic again.
John
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