1. A 3.0-kilogram mass changes speed from 5.0 meters per second to 20 meters per second. What is thechange in the object's momentum?2. A 0.050-kg bullet is fired from a 4.0-kg rifle that is initially at rest. If the bullet leaves the rifle withmomentum having a magnitude of 20. kg•m/s, what will the magnitude of the momentum that the riflerecoils with be?3. A toy railroad engine having a mass of 1.5 kg and moving on a straight track at 0.20 m/s collides with asimilar engine ahead of it moving in the same direction at 0.12 m/s. On colliding, the engines lock andremain together. (a) What is the momentum of each engine before the collision? (b) What is themagnitude and direction of the momentum of both engines after the collision? (c) What is the velocity ofthe pair of engines after the collision?4. When a car of mass 2.0 × 10³ kg moving at 9.0 m/s collides head on with a second car having a mass of1.5 x 10 kg, the cars lock and come to rest at the point of collision. What was the velocity of the secondcar before the collision?5. A 1-kg body moving forward at 5 m/s hits a second body at rest. After the collision, the 1-kg bodyreverses its direction and moves at 1 m/s while the second body moves forward at 2 m/s. What is themass of the second body?

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Answered: A 3.0-kilogram mass changes speed from…

A 3.0-kilogram mass changes speed from 5.0 meters per second to 20 meters per second. What is the change in the object's momentum?

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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Question

1. A 3.0-kilogram mass changes speed from 5.0 meters per second to 20 meters per second. What is the
change in the object's momentum?
2. A 0.050-kg bullet is fired from a 4.0-kg rifle that is initially at rest. If the bullet leaves the rifle with
momentum having a magnitude of 20. kg•m/s, what will the magnitude of the momentum that the rifle
recoils with be?
3. A toy railroad engine having a mass of 1.5 kg and moving on a straight track at 0.20 m/s collides with a
similar engine ahead of it moving in the same direction at 0.12 m/s. On colliding, the engines lock and
remain together. (a) What is the momentum of each engine before the collision? (b) What is the
magnitude and direction of the momentum of both engines after the collision? (c) What is the velocity of
the pair of engines after the collision?
4. When a car of mass 2.0 × 10³ kg moving at 9.0 m/s collides head on with a second car having a mass of
1.5 x 10 kg, the cars lock and come to rest at the point of collision. What was the velocity of the second
car before the collision?
5. A 1-kg body moving forward at 5 m/s hits a second body at rest. After the collision, the 1-kg body
reverses its direction and moves at 1 m/s while the second body moves forward at 2 m/s. What is the
mass of the second body?

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