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9 July, 11:00

In a physics lab, a 60-kg student runs up a 2.0-meter tall flight of stairs in 1.5 seconds. The student's power rating is approximately a. 20 b. 45 c. 80 d. 180 e. 200 f. 450 g. 800 h. 1800 w.

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  1. 9 July, 14:56
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    g. 800

    Explanation:

    Mass = 60-kg

    Distance = 2m

    Time = 1.5s

    Using g = 10m/s^2

    power rating = Work/time

    Work = force * distance

    = Mass * acceleration due to gravity * distance

    = 60 * 10 * 2

    = 1200 J

    Power rating = 1200/1.5

    = 800 J/s = 800Watts
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