In order to know whether an object’s displacement is positive or negative, we need to know which direction has been chosen to be positive. Displacement is the change in position, and therefore it is independent of the location chosen for the origin. When she returns to her original position, her speed is the same as it was initially that is, 4.5 m/s.
A ball thrown straight upward and caught when it returns to its release point has zero average velocity, but it has been accelerating the entire time. An example would be a ball thrown straight upward at the top of its trajectory its velocity is zero, but it has a nonzero acceleration downward. This doesn’t change the fact that the initial upward speed is nonzero. If you throw a ball upward, for example, you might choose the release point to be y = 0. For example, your friends might have backed out of a parking place at some point in the trip, giving a negative velocity for a short time. For example, if you drive with constant speed in a circular path, your speedometer maintains the same reading, even though your velocity is constantly changing. A speedometer measures speed, not velocity. The distance traveled, however, is roughly 25,000 miles. After one complete orbit the astronaut’s displacement is zero. You can tell this by the fact that an odometer has a nonzero reading after a round trip. An odometer measures the distance traveled by a car. 2 – 1 Chapter 2: One-Dimensional Kinematics Answers to Even-Numbered Conceptual Questions 2. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. This material is protected under all copyright laws as they currently exist. Download One-Dimensional Kinematics - Even Questions Answers | PHYS 1111 and more Physics Study notes in PDF only on Docsity!Copyright © 2010 Pearson Education, Inc.
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