A train starting from rest travels the 1st part of its journey with a constant acceleration , the 2nd part of its journey with a constant speed , and the 3rd part of journey with a constant deceleration . If the average speed of the whole journey is, 7/8v A. Draw a velocity-time graph to describe the motion b.Show that the train travels at a constant speed for 75% of the time. c.Find also what fraction of the whole distance is described with constant speed.

Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter2: Motion In One Dimension
Section: Chapter Questions
Problem 25P: A truck on a straight road starts from rest, accelerating at 2.00 m/s2 until it reaches a speed of...
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A train starting from rest travels the 1st part of its journey with a constant acceleration , the 2nd part of its journey with a constant speed , and the 3rd part of journey with a constant deceleration . If the average speed of the whole journey is, 7/8v

A. Draw a velocity-time graph to describe the motion

b.Show that the train travels at a constant speed for 75% of the time.

c.Find also what fraction of the whole distance is described with constant speed. 

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