I have this problem on a web assignment due on the 20th of this month. A few of the problems have completely blown my mind including the following: A force F0 causes an acceleration of 18 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 I know F=ma, but doesn't seem to be enough to solve this problem. I have also included a picture of the diagram which accompanied this problem. I would appreciate any help or guidance that could point me in the right direction.