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PHY 201
Your 'cq_1_02.1' 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 4 cm/sec and ends with a
velocity of 10 cm/sec.
What is your best guess about the ball's average
velocity?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
I would guess around 7 cm/sec. This is the average of
the two stated velocities. (Initial + Final)/2
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Without further information, why is this just a guess?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
The definition of average velocity is the change in
position divided by the change in clock time. This
information is missing.
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If it takes 3 seconds to get from the first velocity to
the second, then what is your best guess about how far
it traveled during that time?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
The approximate distance covered in this time would be
21 cm. Change in position = average velocity * time.
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At what average rate did its velocity change with
respect to clock time during this interval?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
This would be the average acceleration, by definition
average acceleration = average velocity / change in
time. 7 cm/s / 3 sec = 2.33 cm/s^2
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@& 7 cm/s is average velocity, not change in velocity. The calculation of the average rate of change of velocity with respect to clock time requires the change in velocity.
Good attempt, and you made a very common error; just make sure you understand.*@
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&#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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