A 620-g object traveling at 2.1 m/s collides head-on with a 320-g object traveling in the opposite direction at 3.8 m/s. If the collision is perfectly elastic, what is the change in the kinetic energy of the 620-g object? O It loses 1.4 J. O It gains 0.69 J. It loses 0.23 J. O It loses 0.47 J.

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