Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 3 - Think and Rank: 44

Answer

a. C, B, A b. A=B=C

Work Step by Step

The acceleration of each ball is $10 \frac{m}{s^{2}}$ at all times, directed downward. Freefall acceleration is discussed on pages 46-49. One second after being thrown, ball A is at rest. One second after being thrown, ball B is moving at 5 m/s upward. One second after being thrown, ball C is moving at -7 m/s, which is a speed of 7 m/s directed downward. Ball C is moving faster than any other ball, because speed is the magnitude of the velocity, irrespective of direction.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.