There are tank fired kinetic anti tank rounds. Depleted uranium darts are devastating. But to answer your question, I believe the energy released by a kinetic

There are tank fired kinetic anti tank rounds. Depleted uranium darts are devastating. But to answer your question, I believe the energy released by a kinetic impactor quadruples every time you increment a Mach number. So a kinetic impact at Mach 4 is 16x more energetic than a mach 2 impact.