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Gaokao Physics Practice Question

两节动车的额定功率分别为 $P_1$ 和 $P_2$ ，在某平直铁轨上能达到的最大速度分别为 $v_1$ 和 $v_2$ 。现将它们编成动车组，该动车组在运行时受到的阻力在编组前后不变，则该动车组在此铁轨上能达到的最大速度为 （ ）

  1. A.$\frac{P_1 v_1 + P_2 v_2}{P_1 + P_2}$
  2. B.$\frac{P_2 v_2 + P_2 v_1}{P_1 + P_2}$
  3. C.$\frac{(P_1 + P_2) v_1 v_2}{P_1 v_1 + P_2 v_2}$
  4. D.$\frac{(P_1 + P_2) v_1 v_2}{P_1 v_2 + P_2 v_1}$

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