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A billiard ball collides in an elastic head-on collision with a second identical ball. What is...

A billiard ball collides in an elastic head-on collision with a second identical ball. What is the kinetic energy of the system after the collision compared to that before the collision?
(a) the same
(b) one forth
(c) twice
(d) four times
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Answer #1
(a) the same
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