Quiz:planets such as Saturn posses nearly circular rings,consider a homogeneous ring of mass M and radius R.Suppose a particle with mass m is moving along the axis with initial speed v toward the center, and its initial position is x from the center,find the speed of particle when it is passing through the center of the ringQuiz: planets such as Saturn posses nearly circular rings, consider a homogeneous ring of mass M and radius R. Suppose a particle with mass m is moving along the axis with initial speed v toward the center, and its initial position is x from the center, find the speed of particle when it is passing through the center of the ring