Hi, A block of mass 'm' slides on a wedge of mass M. The wedge also moves on a smooth frictionless surface. Find the acceleration of the wedge. I have written down the equations of motion for the wedge and the block but dont know how to proceed further as there are more variables than equations: a= ax + ay (block) A = acceleration of wedge For block: [tex]Nsin\theta = m(ax)[/tex] [tex]Ncos\theta - mg = m(ay)[/tex] For wedge: B is the normal reaction by the ground on Wedge [tex] B = mg + Ncos\theta[/tex] What do I do after this? I think I have to work out a constraint relation here but I am not sure how to do it. Please help.