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Chapter 2: Q43PE (page 83)
A basketball referee tosses the ball straight up for the starting tip-off. At what velocity must a basketball player leave the ground to rise above the floor in an attempt to get the ball?
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Give an example in which velocity is zero yet acceleration is not.
A student drove to the university from her home and noted that the odometer reading of her car increased by . The trip took .
(a) What was her average speed?
(b) If the straight-line distance from her home to the university is in a direction south of east, what was her average velocity?
(c) If she returned home by the same path after she left, what were her average speed and velocity for the entire trip?
An object that is thrown straight up falls back to Earth. This is one-dimensional motion.
(a) When is its velocity zero?
(b) Does its velocity change direction?
(c) Does the acceleration due to gravity have the same sign on the way up as on the way down?
(a) By taking the slope of the curve in Figure 2.60, verify that the velocity of the jet car is\({\bf{115}}{\rm{ }}{\bf{m}}/{\bf{s}}\)at\(t = {\rm{ }}{\bf{20}}{\rm{ }}{\bf{s}}\). (b) By taking the slope of the curve at any point in Figure 2.61, verify that the jet car’s acceleration is\({\bf{5}}.{\bf{0}}{\rm{ }}{\bf{m}}/{{\bf{s}}^{\bf{2}}}\).
What is the last thing you should do when solving a problem? Explain.
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