1. The problem statement, all variables and given/known data The point on the bottom of a rolling object is instantaneously at rest (v = 0). What is the acceleration of that point? 2. Relevant equations 3. The attempt at a solution The formula given is a = [tex]\alpha[/tex]r, and r = 0. So I'm guessing it's zero as well, although that doesn't seem to make logical sense. Can anyone confirm that the answer is indeed zero? (By the way, the equation for v = [tex]\omega[/tex]r, and in this case r = 0. So r has to be zero for the equation for a as well.