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?

A particle of mass m is moving in a horizontal circle of radius R under a centripetal force equal to $$-\frac{A}{R^2}$$ (A = constant). The total energy of the particle is

A force of 20 N is applied on a body of mass 5 kg resting on a horizontal plane. The body gains a kinetic energy of 10 J after it moves a distance 2 m. The frictional force is