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A 1000 kg sports car accelerates from 0 to 30 m/s in 10 s. What is the average power of the engine?

  • physics -

    Power is work done per unit time.

    Average power is increase in work/energy divided by the duration for the increase.

    initial kinetic energy, Ei = 0
    final kinetic energy, Ef
    = (1/2)mv²
    = (1/2)1000 30² kg-m²-s-2
    duration, t = 10 s

    Average power
    = (Ef-Ei)/t
    = 45,000 W (or joules-s-1

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