1. The problem statement, all variables and given/known data a mass z is held on an incline plane with mass P. when the the masses are released, both objects begin to move and accelerate. find accell of the incline plane GIVEN: z,P,angle A, surfaces are frictionless solve in terms of these variables. 2. Relevant equations f=ma 3. The attempt at a solution i chose my positive x direction along the ground surface below the incline plane, toward the direction of its motion. so first i solved for the small mass on top the normal force, which is the force which applied onto the incline plane by the small mass. fnety=0=FNcosA - zg FN= zg/cosA now when i do the FBD of the incline plane the forces acting on it, are the normal (FN) which gives it an unbalanced force in the +X direction. so i get the expression fnetx= (z+P)a=FNsinA subbing in the FN,i get a= zgtanA/(z+P) is this correct? if not can you tell me where i am going wrong.