In an elastic collision, if the momentum is conserved, then which of the following statements is true about kinetic energy?

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Newton's second law in terms of momentum:  The rate of change of momentum of an object is equal to the net force applied to it.
The law of conservation of momentum: The total momentum of an isolated system of objects remains constant.

Newton's second law for a system of particles: The sum of all forces acting on the system is equal to the total mass of the system times the acceleration of its center of mass.
 


In an elastic collision, if the momentum is conserved, then which of the following statements is true about kinetic energy?