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OpenStudy (anonymous):
Elastic Collisions: "A charging bull elephant with a mass of 5400kg comes directly toward you with a speed of 4.30 m/s. You toss a 0.150 kg ball at the elephant with a speed of 8.11 m/s. " (a) When the ball bounces back toward you, what is its speed? (b) How do you account for the fact that the ball's kinetic energy has increased? **The answer in the back of the book for (a) is 17 m/s.**
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