SOLUTION: I have tried this one several times and can not get the answer. The stopping distance d of a car after the brakes are applied varies directly as the square of the speed r. If a car
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Question 320142: I have tried this one several times and can not get the answer. The stopping distance d of a car after the brakes are applied varies directly as the square of the speed r. If a car travelling 70 mph can stop in 270 ft, how many feet will it take the same car to stop when it is travelling 30 mph?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
The stopping distance d of a car after the brakes are applied varies directly as
the square of the speed r.
If a car traveling 70 mph can stop in 270 ft, how many feet will it take the
same car to stop when it is traveling 30 mph.
:
Use a ratio equation, find d for 30 mph:
=
:
=
cross multiply
4900d = 900 * 270
:
4900d = 243000
d =
d = 49.6 ft, stopping distance at 30 mph
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