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course Phy 121
September 17, 2011 at 5:12 p.m.
________________________________________The problem:
A ball is moving at 10 cm/s when clock time is 4 seconds, and at 40 cm/s when clock time is 9 seconds.
• Sketch a v vs. t graph and represent these two events by the points (4 sec, 10 cm/s) and (9 s, 40 cm/s).
answer/question/discussion (start in the next line):
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• Sketch a straight line segment between these points.
answer/question/discussion (start in the next line):
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• What are the rise, run and slope of this segment?
answer/question/discussion (start in the next line):
Rise = 30 cm/s
Run = 5 sec
Slope = 6
@& The slope has units, which must be included.
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• What is the area of the graph beneath this segment?
answer/question/discussion (start in the next line):
Area = Slope 6 cm/s* Width 5 sec = 30 cm
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@& Good. but be sure to see my note.*@