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17 September, 21:46

A boy Is it running with a kinetic energy of 810 J. If the boy has a mass of 80 kg what is his speed

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Answers (2)
  1. 17 September, 22:06
    0
    10.125
  2. 17 September, 23:31
    0
    4.5 m/s

    Explanation:

    Kinetic energy is:

    KE = ½ mv²

    where m is mass and v is velocity.

    Given KE = 810 J and m = 80 kg:

    810 J = ½ (80 kg) v²

    v = 4.5 m/s
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