how long does it take to move upwards
Any point along the circular line at the center of the ring of the doughnut shaped mass will still undergo gravitational pressure from the fact that it is not centered on the total mass of the ring.
https://www.quora.com/Where-is-the-center-of-gravity-of-a-dense-and-massive-doughnut-located-And-what-shape-would-it-have-Would-it-be-a-point-at-the-center-of-its-empty-hole-or-a-gravity-line-in-the-center-of-the-doughnuts-ring. answerd byJeffery Werbock - musician and lecturer
Law of intertia
The question has an apsistance but instead of this i have an idea.
Equivalent force sould be equal to frictional force. Additionally we know that the frictional force direction is opposite direction of velocity. As a result we can easily see that if the bowling ball is on move, it will want going on. If it not, won't.
Have a good works..