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Fundamentals of Physics | 10th Edition | ISBN: 9781118230725 | Authors: David Halliday; Robert Resnick; Jearl Walker
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An automobile travels on a straight road for 40 km at 30

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QUESTION:

An automobile travels on a straight road for 40 km at 30 km/h. It then continues in the same direction for another 40 km at 60 km/h.

(a) What is the average velocity of the car during the full 80 km trip? (Assume that it moves in the positive x direction.)

(b) What is the average speed?

(c) Graph x versus t and indicate how the average velocity is found on the graph.

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QUESTION:

An automobile travels on a straight road for 40 km at 30 km/h. It then continues in the same direction for another 40 km at 60 km/h.

(a) What is the average velocity of the car during the full 80 km trip? (Assume that it moves in the positive x direction.)

(b) What is the average speed?

(c) Graph x versus t and indicate how the average velocity is found on the graph.

ANSWER:

Step 1 of 4 a) We need to find out the average velocity of the car. Let is the velocity of the automobile while traveling on the straight line for . Implies the time taken, That is time taken is, Similarly is the velocity of the automobile while traveling on the straight line for the rest . Implies the time taken, That is time taken is, The total time taken for the whole trip is,

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