1. $$\frac{2}{3}{\text{m}}{{\text{r}}^2}$$
  2. $$\frac{2}{5}{\text{m}}{{\text{r}}^2}$$
  3. $$\frac{7}{3}{\text{m}}{{\text{r}}^2}$$
  4. $$\frac{7}{5}{\text{m}}{{\text{r}}^2}$$
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Answer: Option 4

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