Power

AP Physics 1· difficulty 2/5

A 50 kg50~\text{kg} student climbs a 4 m4~\text{m} flight of stairs in 5.0 s5.0~\text{s}. Using g10 m/s2g \approx 10~\text{m/s}^2, the average power output against gravity is

  • A

    400 W400~\text{W}

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  • B

    2000 W2000~\text{W}

  • C

    200 W200~\text{W}

  • D

    40 W40~\text{W}

Explanation

W=mgh=(50)(10)(4)=2000 JW = m g h = (50)(10)(4) = 2000~\text{J}. P=W/t=400 WP = W/t = 400~\text{W}.

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