A wooden block (block W) and a metallic block (block M) are tied together by a lightweight cord and slide down an inclined plane at an angle $\theta=30^{\circ}$ to the horizontal. The masses of the blocks are $m_W=m_M=5.0\ kg$. The coefficients of friction for the wooden and metallic blocks are $\mu_{W}=0.25$ and $\mu_{M}=0.35$, respectively. Calculate the acceleration of the system as the blocks slide down the incline.