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phy 121
Your 'cq_1_05.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
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The problem:
A ball accelerates at 8 cm/s^2 for 3 seconds, starting with velocity 12 cm/s.
What will be its velocity after the 3 seconds has elapsed?
answer/question/discussion: ->->->->->->->->->->->-> :
36 cm/s
@& If the ball started from rest and ended up at 36 cm/s, then uniform acceleration would imply average velocity 18 cm/s.
However the ball started at 12 cm/s.*@
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Assuming that acceleration is constant, what will be its average velocity during this interval?
answer/question/discussion: ->->->->->->->->->->->-> :
18 cm/s
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How far will it travel during this interval?
answer/question/discussion: ->->->->->->->->->->->-> :
The first second, it will travel 12 cm. During the second, it will travel 20 cm. The third second will see an additional distance of 36 cm, for a total of 68 cm.
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5 minutes
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@& The ball does not stay at 12 cm/s for the entire first second. Its velocity increases during that second, to 20 cm/s (as you clearly understand). So it averages 16 cm/s during the first second.
Check the link at the end for a more efficient way to answer this question.
&#See any notes I might have inserted into your document, and before looking at the link below see if you can modify your solutions. If there are no notes, this does not mean that your solution is completely correct.
Then please compare your old and new solutions with the expanded discussion at the link
Solution
Self-critique your solutions, if this is necessary, according to the usual criteria. Insert any revisions, questions, etc. into a copy of this posted document. Mark any insertions with &&&& so they can be easily identified.If your solution is completely consistent with the given solution, you need do nothing further with this problem. &#
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