Alfred whizzes around the ice-skating rink and suddenly sees his small brother Aldrich at rest directly in his path. Rather than knock him over, he picks Aldrich up and continues in motion without stopping. Consider both Alfred and Aldrich as part of one system, and there are no outside forces acting on it. Answer the following and explain your answer each item:Before Collision: Mass (kg)Velocity (m/s)Momentum (kg.m/s)Alfred754300 kg. m/sAldrich4000 kg. m/sTotal momentum300 kg. m/s After Collision: Does Alfred’s speed increase or decrease? Does Aldrich’s speed increase or decreaseWhat is new speed of both boys after collision?

Given: Alfred - mass m = 75 kg…

Answered: Alfred whizzes around the ice-skating…

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter9: Momentum And Its Conservation

Section: Chapter Questions

Problem 70A

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Alfred whizzes around the ice-skating rink and suddenly sees his small brother Aldrich at rest directly in his path. Rather than knock him over, he picks Aldrich up and continues in motion without stopping. Consider both Alfred and Aldrich as part of one system, and there are no outside forces acting on it. Answer the following and explain your answer each item:

Before Collision:

	Mass (kg)	Velocity (m/s)	Momentum (kg.m/s)
Alfred	75	4	300 kg. m/s
Aldrich	40	0	0 kg. m/s
Total momentum	300 kg. m/s

After Collision:

Does Alfred’s speed increase or decrease?
Does Aldrich’s speed increase or decrease
What is new speed of both boys after collision?

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