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8.4 Exercise 3

Avg difficulty 2.5

Puck A (200 g) slides across a frictionless surface to collide with puck B (800 g), initially at rest. The velocity of each puck is measured during the experiment as follows:

TimeVelocity AVelocity B
0+8.0 m/s0
1.0 s+8.0 m/s0
2.0 s−2.0 m/s+2.5 m/s
3.0 s−2.0 m/s+2.5 m/s

What is the change in momentum of the center of mass of the system as a result of the collision?

  1. +1.6 kg•m/s
  2. +0.8 kg•m/s
  3. 0
  4. −1.6 kg•m/s

OpenStax College Physics 2e, 8.4 Elastic Collisions in One Dimension, exercise 3

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Adapted from College Physics © 2022 Rice University. Licensed under CC BY 4.0. Sources: College Physics 2e, College Physics for AP® Courses 2e. Imported at revision f98d7a7.