**12. The positions of objects A and B are graphed at right. Answer the following questions and explain. a) Is the acceleration of object A positive, negative, or zero at t = 2 s? b) At t = 2 s, is object B speeding up, slowing down, or mov- ing with constant speed? c) Is the acceleration of object B positive, negative, or zero at t = 2 s? d) Do the two objects ever have the same position? If so, when? e) Which object has the greater speed at t = 11 s? f) Find the average velocity of object B for the 20-second interval shown. g) Estimate the instantaneous velocity of object A at t = 15 s. Position (m) 200 100 0 -100 -200 0 2 4 6 A B 8 10 12 14 16 18 t (s) 20

**12. The positions of objects A and B are graphed at right. Answer the following questions and explain. a) Is the acceleration of object A positive, negative, or zero at t = 2 s? b) At t = 2 s, is object B speeding up, slowing down, or mov- ing with constant speed? c) Is the acceleration of object B positive, negative, or zero at t = 2 s? d) Do the two objects ever have the same position? If so, when? e) Which object has the greater speed at t = 11 s? f) Find the average velocity of object B for the 20-second interval shown. g) Estimate the instantaneous velocity of object A at t = 15 s. Position (m) 200 100 0 -100 -200 0 2 4 6 A B 8 10 12 14 16 18 t (s) 20

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Description: ** 12. The positions of objects A and B are graphed at right.Answer the following questions and explain.a) Is the acceleration of object A positive, negative, or zero att = 2 s?b) At t = 2 s, is object B speeding up, slowing down, or mov-ing with co

College Physics

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ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

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Concept explainers

Displacement, Velocity and Acceleration

In classical mechanics, kinematics deals with the motion of a particle. It deals only with the position, velocity, acceleration, and displacement of a particle. It has no concern about the source of motion.

Linear Displacement

The term "displacement" refers to when something shifts away from its original "location," and "linear" refers to a straight line. As a result, “Linear Displacement” can be described as the movement of an object in a straight line along a single axis, for example, from side to side or up and down. Non-contact sensors such as LVDTs and other linear location sensors can calculate linear displacement. Non-contact sensors such as LVDTs and other linear location sensors can calculate linear displacement. Linear displacement is usually measured in millimeters or inches and may be positive or negative.

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