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16 December, 13:41

A boy is running with kinetic energy of 810j if the boy has a mass of 80kg what is his peed

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  1. 16 December, 13:51
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    KE = (1/2) mv² ⇒ v=√ (2KE/m)

    dа ta:

    KE=kenetic energy=810 J

    m=mass=80 Kg

    v=velocity (speed)

    v=√ (2KE/m)

    v=√ (2*810 J/80 Kg) = 4.5 m/s.

    answer: his speed is 4.5 m/s.
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