Ball bounces back elastically


Question: A charging bull elephant with a mass of 5500 kg comes directly toward you with a speed of 4.20 m/s. You toss a 0.150-kg rubber ball at the elephant with a speed of 9.63 m/s.

(a) When the ball bounces back elastically toward you, what is its speed?

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Physics: Ball bounces back elastically
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