$A$ goods train accelerating uniformly on a straight railway track approaches an electric pole standing on the side of the track. Its engine passes the pole with velocity $u$ and the guard's room passes with velocity $v$. The middle wagon of the train passes the pole with a velocity of:

  • A
    $\frac{u + v}{2}$
  • B
    $\frac{1}{2}\sqrt{u^2 + v^2}$
  • C
    $\sqrt{uv}$
  • D
    $\sqrt{\frac{u^2 + v^2}{2}}$

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