check my answer

police can estimate the speed of a vehicle before the brakes are applied using the formula 0.75d=s^2/30.25, where s is the speed in miles per hour and d is the length of the vehicle's skid marks. what was the approximate speed of a vehicle that left skid marks measuring 140 feet?
A. about 10 miles per hour

Question

check my answer

police can estimate the speed of a vehicle before the brakes are applied using the formula 0.75d=s^2/30.25, where s is the speed in miles per hour and d is the length of the vehicle's skid marks. what was the approximate speed of a vehicle that left skid marks measuring 140 feet? 
A. about 10 miles per hour <-- my answer 
B. about 75 miles per hour 
C. about 15 miles per hour 
D. about 56 miles per hour

anonymous · Answer

I got D.
.75(140)=s^2/30.25 Distribute:
105=s^2/30.25 Multiply by 30.25:
3176.25=s^2 Find the square root of 3176.25
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