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13 September, 07:26

The braking distance D in feet required to stop a car traveling x miles per hour on dry, level pavement can be approximated by D=1/9x^2

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  1. 13 September, 10:40
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    We can find as follows

    x D=x^2/9

    speed braking distance

    mph in feet

    20 44.44

    60 400.00

    b) x^2/9=16

    x^2=144

    x=12 mph
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