A soda can (r=3cm) rolling at 2 m/s to the right is stopped in 1 m. What is its angular acceleration? (a is constant)
Angular speed w goes from V/r = 66.67 rad/s to 0 while rolling 1 m. The time required to roll that far is (distance)/(average V) = 1 m / 1 m/s = 1.00 s
Angular acceleration = -66.67/1
= -66.67 rad/s^2