A block of mass \( M \) is initially at rest on a horizontal table. The coefficient of kinetic friction between the block and the table is \( \mu_k \). A projectile of mass \( m \) is fired horizontally at the block with an initial speed \( v_0 \). The projectile passes completely through the block and emerges from the right side with a final speed of \( \dfrac{v_0}{3} \). After the collision, the block slides a distance \( D \) across the table before coming to rest.