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):
The average velocity is the change in position divided by the change in clock time: 30 cm / 5 seconds = 6 cm’s per second.
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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 initial velocity is 0 and the average velocity is 6 cm’s per second, then the final velocity is double that of its initial then the
final velocity is 12 cm’s per second.
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• By how much did its velocity therefore change?
answer/question/discussion (start in the next line):
6 cm’s per second = 12 – 6
This is the difference between average and final velocities. This is not the change in velocity on the interval. The change is from the
initial to the final velocity on the interval.
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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):
The average rate is equal to the change in velocity with respect to the change in clock time = 6 cm’s per second / 5 seconds = 1.2 cm’s per
second is the average rate its velocity changed with respect to clock time.
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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):
The graph would have two points on it with a line drawn to connect them, and it has the seconds on the x axis and the velocity on the y axis.
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Check the links for a couple of simple but very important clarifications.
&#See any notes I might have inserted into your document. If there are no notes, this does not mean that your solution is completely correct.
Then please compare your 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. &#