Question 1056051: The stopping distance of ,d , of a particular car after the brakes are applied varies directly as the square of the rate .r, if the car is traveling 40 mph , it can stop in 80 feet. how many feet will it take the same car to stop when it is traveling 80 mph ?
Answer by ankor@dixie-net.com(22740)   (Show Source):
You can put this solution on YOUR website! The stopping distance of ,d , of a particular car after the brakes are applied varies directly as the square of the rate .r,
if the car is traveling 40 mph , it can stop in 80 feet.
r^2 * k = d
40^2*k = 80
1600k = 80
k = 80/1600
k = .05 the constant of the variation
:
"how many feet will it take the same car to stop when it is traveling 80 mph?"
d = .05*80^2
d = 320 ft to stop at 80 mph
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