Can Vmg exceed the V of a jet exhaust?
As a lowly PPL who occasionally sits behind a piston engine, a question about jet turbines has been bothering me: Is the velocity of the output ie exhaust of a jet engine equal to the aircraft's Vmg in still air once it is cruising? If it's not, then how does an aircraft achieve, say, Mach 2 with a jet exhaust slower than Mach 2? If it does, is it something to do with acceleration? Please excuse the ignorance!