Glencoe Physical Science 2012 Student Edition (Glencoe Science) (McGraw-Hill Education)
Glencoe Physical Science 2012 Student Edition (Glencoe Science) (McGraw-Hill Education)
1st Edition
ISBN: 9780078945830
Author: Charles William McLaughlin, Marilyn Thompson, Dinah Zike
Publisher: Glencoe Mcgraw-Hill
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Chapter 2, Problem 13STP
To determine

The acceleration of a car in m/s2 .

Expert Solution & Answer
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Answer to Problem 13STP

The acceleration of the car is a=11.11m/s2 .

Explanation of Solution

Given:

The initial velocity of the car is u=40km/h .

Time is t=5s .

Final velocity is v=0m/s .

Formula used:

The equation for the final velocity of the car is

  v=u+at  ...... (1)

Here, u,a,t and v are initial velocity, acceleration, time and final velocity.

Calculation:

Rearrange the equation (1)

  a=vut  ...... (2)

Substitute 40km/h for u , 0km/h for v and 5 s for t in equation (2)

  a=0km/h40km/h5sa=(40km/h)(1000m1km)(1h3600s)5sa=11.11m/s2

Conclusion:

Hence,the acceleration of the car is a=11.11m/s2 .

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