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31 July, 11:25

4) A drag racer starts from rest and accelerates at 10 m/s2 for the entire distance of 400 m (1/4

mile). What is the velocity of the race car at the end of the run?

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  1. 31 July, 14:52
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    Start with the givens and the unknown:

    vi = 0

    a = 10

    d = 400

    vf = ?

    The kinematics equation incorporating these variables is:

    vf^2 = vi^2 + 2ad

    vf^2 = 0 + 2 (10) (400)

    vf^2 = 8000

    vf = 89.4 m/s
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