Return to the Chapter-Opening Questions, page 170, and
Chapter 7, Problem 7EE(choose chapter or problem)
Problem 7EE
Return to the Chapter-Opening Questions, page 170, and answer them again now. Try to explain why you may have answered differently the first time.
CHAPTER-OPENING QUESTIONS
1. A railroad car loaded with rocks coasts on a level track without friction. A worker at the back of the car starts throwing the rocks horizontally backward from the car. Then what happens?
(a) The car slows down.
(b) The car speeds up.
(c) First the car speeds up and then it slows down.
(d) The car’s speed remains constant.
(e) None of these.
2. Which answer would you choose if the rocks fall out through a hole in the floor of the car, one at a time?
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