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22 February, 21:16

A car with mass 450 kg has a kinetic energy of 16,256 J. What is the speed of the car?

A. 5.9 m/s

B. 1.2 m/s

C. 8.5 m/s

D. 11.2 m/s

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Answers (1)
  1. 22 February, 23:23
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    The equation for kinetic energy is

    E = 1/2 m v^2

    Isolating for the speed gives us

    v = sqrt (2E/m),

    that is the square root of 2 times the energy divided by the mass.

    This gives us a speed of

    v = 8.5 m/s

    So the answer is C.
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