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12. The positions of objects A and B are graphed at right. mswer 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 20 t (s)

12. The positions of objects A and B are graphed at right. mswer 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 20 t (s)

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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** 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 -100 -200 A 02 468 10 t (s) B 12 14 16 18 20
Transcribed Image Text:** 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 -100 -200 A 02 468 10 t (s) B 12 14 16 18 20
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