1. The problem statement, all variables and given/known data A wedge with mass rests on a frictionless horizontal table top. A block with mass is placed on the wedge. There is no friction between the block and the wedge. The system is released from rest. 2. Relevant equations (-gm)/((M+m)tan(alpha)+(M/tan(alpha))) 3. The attempt at a solution The question is to calculate the vertical and horizontal components of the BLOCKS acceleration. I know that the above equation is the acceleration of the wedge, so i know that the acceleration of the block should be equal an opposite. Is this actually true? I'm not too sure. Also, would I swap the tan functions for cosine and sine for horizontal and vertical acceleration respectively? Could some one please point me in the right direction! :) that would be much appreciated!