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How Many Feet Does It Take To Accelerate To 40 Mph?

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Kevin Cronk answered
Depends on the rate of acceleration
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Anonymous answered
For a reasonable estimate, you can use the equation Da = 1.075*(S^2/a), where "Da" is acceleration distance, "S" is speed in mph, and "a" is acceleration.  
Typical acceleration rates for a passenger car vary from about 4.6 to 7.5 and for a semi-trailer truck it varies from about 0.3 to 1.6.

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