You travel from point A to point B in a car moving at a

Chapter 25, Problem 15Q

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QUESTION:

Problem 15Q

You travel from point A to point B in a car moving at a constant speed of 70km/h Then you travel the same distance from point B to another point C. moving at a constant speed of 90 km/h Is your average speed for the entire trip from A to C equal to 80 km/? Explain why or why not.

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QUESTION:

Problem 15Q

You travel from point A to point B in a car moving at a constant speed of 70km/h Then you travel the same distance from point B to another point C. moving at a constant speed of 90 km/h Is your average speed for the entire trip from A to C equal to 80 km/? Explain why or why not.

ANSWER:

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https://lh6.googleusercontent.com/DJD5AhRBqFZBmGyk1AKcfUqvRN0EHhxx3rea3f697Wrj6lXwlJ3uaP2vVWRgU8a4XdLzv--8mmC2CfxVkpLV4ocUY7Q3hVP_qBwdoyVA-lQu0WNiVOM8jxfb-pR-mf-c6OR_Wves

The car travels the first half of the total distance at a speed of 70km/h, second half at a speed of 90km/h. We will find the average speed of the car.

 (time passing for the first half of the motion)

 (time passing for the second half of the motion)

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