1. The problem statement, all variables and given/known data Suppose there is a rod on a friction less horizontal plane and an impulse "J" is given to it at a distance "x" from its center. Using this data I have to find out the instantaneous center of rotation. 3. The attempt at a solution By impulse-momentum theorem, J = M*Vcm (Vcm= Velocity of center of mass) and by angular impulse momentum theorem, J*x = I*ω What do I do next?