If kinetic energy of a body is increased by 300%, then percentage change in momentum will be

A particle of mass $$m$$ is moving in a horizontal circle of radius $$r$$ under a centripetal force given by $$\left(\frac{-K}{r^2}\right)$$, where $$K$$ is a constant. Then

Two masses of 1g and 9g are moving with equal kinetic energy. The ratio of magnitude of their momentum is

For motion under central forces, which quantity will be conserved?