A spherical billiard ball of uniform density has mass m and radius R and moment
of inertia about the center of mass . The ball, initially at rest on a table, 5is given a
sharp horizontal impulse by a cue stick
angular momentum about the center of mass of the puck-stick system is constant before and
after the collision. We shall use these
relations to compute the final angular velocity of the puck-stick about the center of mass