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Two billiard balls with identical masses of 1 kg move toward each other. The initial velocity...

Two billiard balls with identical masses of 1 kg move toward each other. The initial velocity of ball 1 is +30 cm/s and the initial velocity of ball 2 is -20 cm/s. The final velocity of ball 1 is -20 cm/s and the final velocity of ball 2 is +30 cm/s. Assume friction and rotation are unimportant. Show, through conservation of energy, that this was indeed an elastic collision. (Hint: Find the kinetic energy of the system before and after the collision. If the values are equal, then indeed
this is an elastic collision.)

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