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Power

AP Physics 1· difficulty 2/5

A car experiences a total resistive (drag + friction) force of 500 N500~\text{N} while cruising at a constant 25 m/s25~\text{m/s}. What power must the engine deliver?

  • A

    12,500 W12{,}500~\text{W}

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  • B

    125 W125~\text{W}

  • C

    20 W20~\text{W}

  • D

    125,000 W125{,}000~\text{W}

Explanation

At constant speed the engine force equals drag, so P=Fv=(500)(25)=12,500 WP = F v = (500)(25) = 12{,}500~\text{W}.

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