The Schwarzschild Black Hole is non rotating type, but other solution like Kerr BH is a rotating type. Case 1: The BH is formed either on account of collapse of a very big star (M >> TOV Limit) or Case 2: on account of accretion of mass by a Neutron Star such that its mass becomes > TOV Limit. This modified TOV limit is taken at around 3 Solar Mass. Theory also says that formation of BH is dynamically timed that is it takes less than a second to form a BH once star is inside EH. Q1. In general the Rotational Kinetic Energy of the Neutron Star is of the order of 10^40 Ergs. So in case Schwarzschild BH is formed due to accretion of mass by Neutron Star, then what happen to this Rotational Kinetic Energy ? Q2. In case of Kerr BH which is rotating type, what rotates ? The mass is at singularity, Ergosphere also cannot be stated to have this energy or mass, then what rotates ? For clarity the mass/energy here is the original BH formation mass/energy...not what is acquired due to accretion. Q3. What do we really mean by non rotating Schwarzschild BH or Rotating Kerr BH, when the inside of EH itself is not interacting with Physical World.