Coursework help!? Moment of inertia/radius of gyration/velocity question 1. The problem statement, all variables and given/known data An engine is suddenly coupled to a rotating drum by a friction clutch. The moment of inertia of the engine is equivalent to a mass of 40Kg acting with a radius gyration of 112mm. The drum has a mass of 12Kg and a radius of gyration of 129mm. The initial velocity of the engine before engagement is 11 rev/s and the drum is initially at rest. Find the velocity of engine and drum immediately after connection. Have no idea where to start, any help would be great thanks?