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Question 439458: Can someone please help me with this problem? Thank you so much.
The braking distance D in feet required to stop a car traveling x mph on dry, level pavement can be approximated by D= 1/9x^2
(a.) Calculate the braking distance for 30 mph and 60 mph. how do your answers compare?
(b.) If the braking distance is 16 feet, estimate the speed of the car.
(c.) Use a calculator to solve part (b) numerically. Do your answers agree?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! The braking distance D in feet required to stop a car traveling x mph on dry, level pavement can be approximated by D= (1/9)x^2
(a.) Calculate the braking distance for 30 mph and 60 mph. how do your answers compare?
D(30) = (1/9)*30^2 = 100 ft.
D(60) = (1/9)*60^2 = 400 ft.
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(b.) If the braking distance is 16 feet, estimate the speed of the car.
16 = (1/9)r^2
r^2 = 16/9
r = 4/3 mph = 1 1/3 mph
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(c.) Use a calculator to solve part (b)
numerically. Do your answers agree?
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Cheers,
Stan H.
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