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 57P: Vector A is 3.00 units in length and points along the positive x-axis. Vector B is 4.00 units in...
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Question
The figure shows a graph of the position of a moving object as a function of time. What is the velocity of the object at each of the following times?
a) At t = 1.0 s
b) At t = 2.5 s
c) At t = 4.0 s
Expert Solution
Step 1
From graph we can say the acceleration from 0 to 2s,2 to 3s,3 to 5s and 5 to 6s is zero(since the slope is constant).
hence instantaneous valocity is equal to average velocity.
we use second equation of motion
s= u*t+0.5*a*t^2
(a) s=u*t + 0
(20-0)=u*(2-0)
u=10m/s answer
(b) (40-20) = u*(3-2)
u=20m/s;
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