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Gaokao Physics Practice Question

质量为 $1.5 \times 10^{3} \mathrm{~kg}$ 的汽车在水平路面上匀速行驶, 速度为 $20 \mathrm{~m} / \mathrm{s}$, 受到的阻力大小为 $1.8 \times 10^{3} \mathrm{~N}$ 。此时, 汽车发动机输出的实际功率是

  1. A.$90 \mathrm{~W}$
  2. B.$30 \mathrm{~kW}$
  3. C.$36 \mathrm{~kW}$
  4. D.$300 \mathrm{~kW}$

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