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Physics / College Physics 1 / Chapter 2 / Problem 23

College Physics | 1st Edition | ISBN: 9781938168000 | Authors: Paul Peter Urone, Roger Hinrichs

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Solved: (a) A light-rail commuter train accelerates at a

Chapter 2, Problem 23

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QUESTION:

Problem 23PE

(a) A light-rail commuter train accelerates at a rate of 1.35 m/s2 . How long does it take to reach its top speed of 80.0 km/h, starting from rest? (b) The same train ordinarily decelerates at a rate of 1.65 m/s2 . How long does it take to come to a stop from its top speed? (c) In emergencies the train can decelerate more rapidly, coming to rest from 80.0 km/h in 8.30 s. What is its emergency deceleration in m/s2 ?

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QUESTION:

Problem 23PE

(a) A light-rail commuter train accelerates at a rate of 1.35 m/s2 . How long does it take to reach its top speed of 80.0 km/h, starting from rest? (b) The same train ordinarily decelerates at a rate of 1.65 m/s2 . How long does it take to come to a stop from its top speed? (c) In emergencies the train can decelerate more rapidly, coming to rest from 80.0 km/h in 8.30 s. What is its emergency deceleration in m/s2 ?

ANSWER:

Step 1 of 5

First we have to find time taken by the rail when it is moving with acceleration 1.35 m/ ${s}^{2}$ to reach

$80\ km/h$ .

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