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 collision?

a. the same as
c. twice
b. one fourth
d. four times


A

Physics & Space Science

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What will be an ideal response?

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A. 21 m B. 18 m C. 15 m D. 12 m E. 8.5 m

Physics & Space Science