Book edition 1st Edition

Author(s) Paul Peter Urone

Pages 1272 pages

ISBN 9781938168000

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Short Answer

If a subway train is moving to the left (has a negative velocity) and then comes to a stop, what is the direction of its acceleration? Is the acceleration positive or negative?

The acceleration will be in the right direction. The acceleration will be shown as positive.

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Step by Step Solution

TABLE OF CONTENTS :

TABLE OF CONTENTS

Step 1: Acceleration and its direction

In terms of both speed and direction, acceleration is the rate at which velocity varies with time. Acceleration is a vector quantity since it has both a magnitude and a direction.

Step 2: Acceleration of train

Here we have to consider the velocity of the train initially, which is moving in the left direction has magnitude V m/s and the direction can be negative sign ass mentioned in the question.

The initial velocity of the train = $- V m/s$ .
The train is stopped after some time T.
The final velocity of the train will be = $0 m/s$ .

Applying the formula of acceleration as:

$\begin{array}{l} a = \frac{ΔV}{T} \\ a = \frac{Final velocity - Intial velocity}{Time} \\ a = \frac{0 - (- V)}{T} \\ a = \frac{V}{T} {m/s}^{2} \end{array}$

Hence it can be said that the train had a positive acceleration, which is opposite to that of the velocity of the train.

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College Physics (Urone)

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Short Answer

If a subway train is moving to the left (has a negative velocity) and then comes to a stop, what is the direction of its acceleration? Is the acceleration positive or negative?

Step by Step Solution

Step 1: Acceleration and its direction

Step 2: Acceleration of train

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College Physics (Urone)

Answers without the blur.

Short Answer

If a subway train is moving to the left (has a negative velocity) and then comes to a stop, what is the direction of its acceleration? Is the acceleration positive or negative?

Step by Step Solution

Step 1: Acceleration and its direction

Step 2: Acceleration of train

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