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# CALC A car is stopped at a traffic light. It then travels ISBN: 9780321675460 31

## Solution for problem 7E Chapter 2

University Physics | 13th Edition

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Problem 7E

CALC A car is stopped at a traffic light. It then travels along a straight road such that its distance from the light is given by x(t) = bt2 - ct3, where b = 2.40 m/s2 and c = 0.120 m/s3. (a) Calculate the average velocity of the car for the time interval t = 0 to t = 10.0 s. (b) Calculate the instantaneous velocity of the car at t = 0, t = 5.0 s, and t = 10.0 s. (c) How long after starting from rest is the car again at rest?

Step-by-Step Solution:

Solution 7E Step 1 : Let us consider the data given Function condition x(t) = bt ct 2 3 2 b = 2.40 m/s c = 0.120 m/s 3 Step 2 : We shall consider the time interval t=0 to t=10.00 s Substituting the values in the condition to find initial and final distances For t=0 s x (0) = 2.40 m/s (0) 0.120(0) m/s 3 3 i xi(0) = 0 m For t=2.00 s 2 2 3 3 x f10.0s) = 2.40 m/s (10) 0.120(10) m/s 2 3 x f10.0s) = 2.40 m/s (100) 0.120(1000) m/s x (10.0s) = 240 m/s 120 m/s = 120 m/s f Step 3 : To find the average velocity of the car xfxi V avg = tfi Substituting the values we get V avg = 1210.000 = 12 m/s

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##### ISBN: 9780321675460

University Physics was written by and is associated to the ISBN: 9780321675460. The answer to “CALC A car is stopped at a traffic light. It then travels along a straight road such that its distance from the light is given by x(t) = bt2 - ct3, where b = 2.40 m/s2 and c = 0.120 m/s3. (a) Calculate the average velocity of the car for the time interval t = 0 to t = 10.0 s. (b) Calculate the instantaneous velocity of the car at t = 0, t = 5.0 s, and t = 10.0 s. (c) How long after starting from rest is the car again at rest?” is broken down into a number of easy to follow steps, and 95 words. This textbook survival guide was created for the textbook: University Physics, edition: 13. Since the solution to 7E from 2 chapter was answered, more than 277 students have viewed the full step-by-step answer. The full step-by-step solution to problem: 7E from chapter: 2 was answered by , our top Physics solution expert on 05/06/17, 06:07PM. This full solution covers the following key subjects: Car, Rest, velocity, light, calculate. This expansive textbook survival guide covers 26 chapters, and 2929 solutions.

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