A man of 50 kg is standing at one end on a boat of length 25m and mass 200 kg. If he starts running and when he reaches the other end, has a velocity 2ms^-1 with respect to the boat. The final velocity of the boat is

• A

  $\frac{2}{3}{\mathrm{ms}}^{-1}$

• B

  $\frac{2}{5}{\mathrm{ms}}^{-1}$

• C

  $\frac{8}{5}{\mathrm{ms}}^{-1}$

• D

  $\frac{8}{3}{\mathrm{ms}}^{-1}$