A charging bull elephant with a mass of 5230 kg comes directlytoward you with a

Question

A charging bull elephant with a mass of 5230 kg comes directlytoward you with a speed of 4.45 m/s. You toss a 0.150-kg rubberball at the elephant with a speed of 7.91 m/s. When the ballbounces back toward you, what is its speed? How do you account forthe fact that the ball's kinetic energy has increased? Thanks! A charging bull elephant with a mass of 5230 kg comes directlytoward you with a speed of 4.45 m/s. You toss a 0.150-kg rubberball at the elephant with a speed of 7.91 m/s. When the ballbounces back toward you, what is its speed? How do you account forthe fact that the ball's kinetic energy has increased? Thanks!

Explanation / Answer

ve=4.45 m/s vb = -7.91 m/s vb - ve = -7.91 - 4.45 = -12.36 v - ve = 12.36 v = 12.36+ve = 16.81 m/s

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