12–11. A particle travels along a straight-line path such that in 4 s it moves from an initial position s =-8 m to a position sg =+3 m. Then in another 5 s it moves from sg to Sc =-6 m. Determine the particle's average velocity and average speed during the 9-s time interval. %3D

12–11. A particle travels along a straight-line path such that in 4 s it moves from an initial position s =-8 m to a position sg =+3 m. Then in another 5 s it moves from sg to Sc =-6 m. Determine the particle's average velocity and average speed during the 9-s time interval. %3D

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter3: Motion Along A Straight Line

Section: Chapter Questions

Problem 113CP: The position of a particle moving along the x -axis varies with time according to x(t)=5.0t24.0t3 ....

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Concept explainers

Relative Velocity

It is a measurement of an object with regards to the other object which is moving or stable or stationary. For example, if we are traveling in a bus and the bus is moving at speed of 50km/hr, then our speed is according to the nearby passenger on the bus is zero. According to them, we are not moving. But if one person standing on the ground or road observes us from outside of the bus, according to him we are moving at a speed of 50km/hr and the bus is also moving at a speed of 50km/hr. Now, the motion is recognized by the observer, it depends on a frame of reference or observer. This is motion called relative motion.

Question

12-11. A particle travels along a straight-line path such
that in 4 s it moves from an initial position s =-8 m to a
position sg =+3 m. Then in another 5 s it moves from så to
sc =-6 m. Determine the particle's average velocity and
average speed during the 9-s time interval.

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