Both the blocks as shown in the given arrangement are given together a horizontal velocity towards
right. If a_CM be the subsequent acceleration of the centre of mass of the system of blocks, then a_CM
will be

• A

  zero

• B

  $\frac{5}{3}{\mathrm{ms}}^{-2}$

• C

  $\frac{7}{3}{\mathrm{ms}}^{-2}$

• D

  $2 {\mathrm{ms}}^{-2}$