1. The problem statement, all variables and given/known data A block of mass m slides down the incline of a triangular block of mass M. The angle of inclination is [tex]\theta[/tex]. The trianguilar block is free to slide on a horizontal plane. Assume that all surfaces are frictionless. What is the acceleration of the mass M? 2. Relevant equations F(net)=ma=0 3. The attempt at a solution so basically i want to ask if my answer is correct, as i'm not familiar with this type of problem, i got: F(horizontal) = mg cos [tex]\theta[/tex] sin [tex]\theta[/tex] a(M, horizontal) = F(horizontal) / (m + M) is this right?