A baseball infielder,mass 75.0 kg,jumps up with velocity 3.00 m/s and catches a 0.150-kg baseball moving horizontally at 50.0 m/s.Of the following,which is closest to the final momentum of the system,infielder and baseball?

Question

Quizplus · Accepted Answer

The correct answer is A because the final momentum of the system is equal to the initial momentum of the system, which is equal to the momentum of the infielder before he jumps plus the momentum of the baseball before he catches it. The momentum of the infielder before he jumps is equal to his mass times his velocity, which is 75.0 kg * 3.00 m/s = 225 kg m/s. The momentum of the baseball before he catches it is equal to its mass times its velocity, which is 0.150 kg * 50.0 m/s = 7.50 kg m/s. The total momentum of the system before he catches the baseball is therefore 225 kg m/s + 7.50 kg m/s = 232.5 kg m/s. The final momentum of the system is therefore also 232.5 kg m/s.

A Baseball Infielder,mass 75