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A position vs. time graph of a frog swimming across a pond has two straight-line sections, each lasting 1 second. The first section has a slope of 1 m/s and the second has a slope of 0 m/s. What is the frog's average velocity over the two seconds?
A0.0 m/s
B0.5 m/s
C1.0 m/s
D2.0 m/s
Answer & Solution
Correct answer: B. 0.5 m/s
1. The slope of each section is the velocity during that section.
2. First second: displacement = (1 m/s)(1 s) = 1 m. Second second: displacement = (0 m/s)(1 s) = 0 m.
3. Total displacement = 1 m over a total time of 2 s.
4. Average velocity = 1 m / 2 s = 0.5 m/s.
_Source: OpenStax Physics (CC BY 4.0), Ch 2 "Motion in One Dimension", section 2.3 Position vs. Time Graphs_
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