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PHY 201
Your 'cq_1_03.1' 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 starts with velocity 0 and accelerates uniformly
down a ramp of length 30 cm, covering the distance in 5
seconds.
What is its average velocity?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
vAve = delta d / delta t
vAve = 30 cm / 5 s = 6 cm/s
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If the acceleration of the ball is uniform then its
average velocity is equal to the average of its initial
and final velocities.
You know its average velocity, and you know the initial
velocity is zero.
What therefore must be the final velocity?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
If the average velocity is 6 cm/s and the acceleration
if uniform, the final velocity will be 2 * average = 12
cm/s.
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By how much did its velocity therefore change?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
12 cm/s
@& This isn't correct. I recommend that you indicate how you are getting your results.*@
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At what average rate did its velocity change with
respect to clock time?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
12 cm/s / 5 s = 2.4 cm/s^2
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What would a graph of its velocity vs. clock time look
like? Give the best description you can.
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
A straight line with a positive slope. It would start
at zero and extend through the first quadrant increasing
in both x and y.
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30 minutes
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@& Most of your answers are correct, but I recommend that you start showing how you are getting your results. This is of course necessary on tests, and it's good practice to do so on these assignments. It also provides me with the information I need to help you correct errors.*@
&#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. &#