I've encountered a problem that I do not believe I am able to answer using my very basic knowledge of classical and calculus-based physics, dealing with knocking objects over. Say we had a cylinder of length L and radius R and mass M. And suppose we shot a bullet of mass m at the very top of the cylinder, and suppose the bullet immediately bounces off the cylinder. In terms of the above quantities, can we find the minimum speed necessary to knock over the cylinder? Is there anything else that needs to be determined? I have found that the cylinder must be lifted greater than 45 degrees off the ground or else gravity will restore it, but I am unsure what the rotational inertia would be of this sort, among other things. Any help would be greatly appreciated!!!