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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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SEED QUESTION 2.3(1_03.1)
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 = ds / dt
vAve =30 cm / 5 sec
vAve = 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):
The final velocity will be 6 cm/s because above the: vAve = 6 cm/s
if v0 = 0 then vf = 2 * vAve
vf = 2 * vAve
vf = 2 * 6
vf = 12 cm/s
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• By how much did its velocity therefore change?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
The velocity doubled from the average velocity.
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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):
Ave. rate = (change in position) / (change in clock time)
Ave. rate = 30 cm / 5 sec
Ave. rate = 6 cm/s
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@& That is the average rate at which position changed.*@
• 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 show the velocity as the values on the y-axis or the rise and the clock times on the x-axis or the run.
@& You could give points on the graph, and describe whether the graph is increasing, constant or decreasing, and if it's changing at an increasing, constant or decreasing rate.*@
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*#&!
@& You are on the right track and shouldn't have any trouble revising this, but be sure to include questions if you do. See my notes.
&#Please see my notes and, unless my notes indicate that revision is optional, submit a copy of this document with revisions and/or questions, and mark your insertions with &&&& (please mark each insertion at the beginning and at the end).
Be sure to include the entire document, including my notes.
If my notes indicate that revision is optional, use your own judgement as to whether a revision will benefit you. &#
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