Three particles of masses 8 kg, 4 kg and 4 kg situated at $(4,1),(-2,2)$ and $(1,-3)m$ are acted upon by external forces $6 \hat {j},-6 \hat {i}$ and $14 \hat {i}\;N$ respectively . The acceleration of the center of Mass of the system is

Question

$$\begin {array} {1 1} (a)\;0.625\;ms^{-2} & \quad (b)\;6.25\;ms^{-2} \\ (c)\;2.2 ms^{-2} & \quad  (d)\;22\;ms^{-2} \end {array}$$