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14 May, 11:19

A charging bull elephant with a mass of 5230 kg comes directly toward you with a speed of 4.45 m/s. You toss a 0.150-kg rubber ball at the elephant with a speed of 7.91 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

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  1. 14 May, 14:01
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    You have to add the speed of that ball plus the speed is running so 4.45 + 7.91 = 12.36m/s
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