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Chapter 2: Q8. (page 41)

Can an object be increasing in speed as its acceleration decreases? If so, give an example. If not, explain.

Short Answer

Expert verified

Yes, an object is increasing in speed as its acceleration decreases.

Step by step solution

01

Step 1. Meaning of acceleration

Acceleration can be defined as the rate of change of velocity of an object. It is a vector quantity since it has both direction and magnitude.

02

Step 2. Citing an example explaining that an object is increasing in speed as its acceleration decreases

Assume the north to be the positive direction. If a car is going south and gaining speed at an increasing rate, the magnitude of its acceleration is large. However, since the acceleration is directed southward, it becomes increasingly negative.

In other words, the acceleration of the car decreases as its speed increases.

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Most popular questions from this chapter

Consider the street pattern shown in Fig. 2鈥�46. Each inter-section has a traffic signal, and the speed limit is 40 km/h. Suppose you are driving from the west at the speed limit. When you are 10.0 m from the first intersection, all the lights turn green. The lights are green for 13.0 s each. (a) Calculate the time needed to reach the third stoplight. Can you make it through all three lights without stopping? (b) Another car was stopped at the first light when all the lights turned green. It can accelerate at the rate of2.00m/s2to the speed limit. Can the second car make it through all three lights without stopping? By how many seconds would it make it, or not make it?

FIGURE 2-46Problem 65

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FIGURE 2-45Problem 62

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