Chapter 2: Q5. (page 41)
Can an object have a northward velocity and a southward acceleration? Explain.
Yes, an object moving in a northward direction can have a southward acceleration.
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Marry and Sally are in a foot race (See below figure). When Mary is 22 m from the finish line, she has a speed of and is 5 m behind Sally, who has a speed of . Sally thinks she has an easy win and so, during the remaining portion of the race, decelerates at a constant rate of to the finish line. What constant acceleration does Mary now need during the remaining portion of the race, if she wishes to cross the finish line side by side with Sally?
A baseball pitcher throws a baseball with a speed of 43 m/s. Estimate the average acceleration of the ball during the throwing motion. In throwing the baseball, the pitcher accelerates it through a displacement of about 3.5 m, from behind the body to the point where it is released. (Fig. 2-37).
An unmarked police car traveling a constantis passed by a speeder traveling. Precisely 1.00s after the speeder passes, the police officer steps on the accelerator; if the police car’s acceleration is, how much time passes before the police car overtakes the speeder (assumed to be moving at constant speed)?
A car traveling at 95 km/h is 210 m behind a truck traveling at 75 km/h. How long will it take for the car to reach the truck?
The position of a rabbit along a straight tunnel as a function of time is plotted in Fig. 2-44. What is its instantaneous velocity (a) at t = 10.0 s and (b) at t = 30.0 s? What is its average velocity (c) between t = 0 and t = 5.0 s, (d) between t = 25.0 s and t= 30.0 s, and (e) between t = 40.0 s and t = 50.0 s.
Figure 2-44Problems 57,58 and 59
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