Change of momentum or average acceleration over half a revolution

1. A.
   the momentum changes by $mv$
2. B.
   the momentum changes by $2mv$
3. C.
   the kinetic energy changes by $\frac{1}{2}mv^2$
4. D.
   the kinetic energy changes by $mv^2$

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1. A.
   $\dfrac{V^2}{r}$
2. B.
   $\dfrac{2V^2}{r}$
3. C.
   $\dfrac{2V^2}{\pi r}$
4. D.
   $\dfrac{V^2}{\pi r}$

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