Acceleration assumed in the wrong direction again!! 1. The problem statement, all variables and given/known data See page 1, this is the problem statement, figure and the solution as supplied in the books manual. 2. Relevant equations 3. The attempt at a solution I solved this problem as seen on page 2, clearly, I assumed the acceleration in the wrong direction. But why is this a problem? Friction is not a factor here and I think the directions for the accelerations that I assumed are reasonable. How can I avoid making this kind of mistake on an exam?? I always seem to pick the wrong direction for the acceleration.