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23 December, 09:10

Here is a formula used to work out the speed v mph of a car making an emergency stop

V=squareroot 21d

D feet is the length of the mark the cars tyres make on the road when making an emergency stop

A car makes an emergency stop the cars tyres make a mark 90 feet long work out the speed of the car give your answer correct to the nearest whole number

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  1. 23 December, 09:17
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    So D = 90 ...

    V = squareroot 21 (90)

    21 (90) = 1890

    squareroot 1890 = 43.47

    V = 43.47 ... to the nearest whole number is 43mph
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