A particle moving with kinetic energy 3 J makes an elastic head-on collision with a stationary particle which has twice its mass. During the impact,  (a) the minimum kinetic energy of the system is 1 J  (b) the maximum elastic potential energy of the system is 2 J  (c) momentum and total energy are conserved at every instant  (d) the ratio of kinetic energy to potential energy of the system first decreases and then increases

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