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Multiple choice

A body starts with initial speed $u$ and moves in a straight line with constant acceleration. It has speed $v$ after covering a distance $2S$. Its speed just after covering distance $S$ is.

  1. $\dfrac{u + v}{2}$
  2. $\sqrt{uv}$
  3. $\sqrt{u^2 + v^2}$
  4. $\sqrt{\dfrac{u^2 + v^2}{2}}$
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