A45 kg ice skater at rest caught a 0.25kg ball, if the ice skater moved at 0.15 m/s after catching the ball, find the speed of the ball before he caught it.

27 m/s

Explanation:

Momentum is conserved.

Initial momentum = final momentum

(0.25 kg) v = (45 kg + 0.25 kg) (0.15 m/s)

v ≈ 27 m/s

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.