An 80 kg runner has 3,000 J of kinetic energy. What is her velocity in m/s?

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An 80 kg runner has 3,000 J of kinetic energy. What is her velocity in m/s?

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Farah 3 years 2021-08-19T18:36:59+00:00 1 Answers 7 views 0

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  1. nguyetanh
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    2021-08-19T18:37:59+00:00
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    Answer: 8.6m/s

    Explanation:From KE=1/2mv^2

    In order to make v the subject of the formula we divide both sides by 1/2m. Thus V^2 will be left alone on the RHS. But we are looking for v and not v^2. Thus we find the square root of KE1/2m

    Meaning V= sqrt[3000÷1/2 of 80]

    =sqrt[3000÷40]

    =sqrt(75)

    =8.6m/s

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