# Math

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Police use a formula s = S √1/L , where S is the test-car speed and L is the test-skid length, to find the actual speed s in an accident which left a skid mark of l. Find the actual speed s (nearest whole mph) when S=45 mph, 1=150 ft, L=100 ft.

• Math -

l and 1 are too confusing.
I will use x for theunknown skid length

s^2 = S^2 (x/L)
s^2 = 45^2 (1.5) = 3037.5
s = 55.1

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