1. The problem statement, all variables and given/known data A force F0 causes an acceleration of 20 m/s2 when it acts on an object of mass m sliding on a frictionless surface. Find the magnitude of the acceleration of the same object in the circumstances shown in each figure below. 2. Relevant equations I cannot figure out how to do this problem without knowing the mass. Can anyone help? 3. The attempt at a solution ?