1. The problem statement, all variables and given/known data A mass of 3kg is acted upon by three forces of 4.0 N, 6.0N, and 9.0N and is in equilibrium. The 9N force is suddenly removed. Determine the acceleration of the mass. 2. Relevant equations F=ma. 3. The attempt at a solution My main problem with this question is that I cannot think of any situation in which these three forces would be in equilibrium. The question does not specify in which direction the forces are in or any angles (in the case of an inclined plane). How can these forces possibly be in equilibrium?