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Phy 121
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.
** CQ_1_03.1_labelMessages.txt **
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=30cm/5sec = 6cm/sec
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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 must be x + 0/2 = 6, x + 0 = 6 * 2, x = 12 or 12cm/sec
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By how much did its velocity therefore change?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
It's velocity changed by 12cm/sec, from zero to 12cm/sec.
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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):
12cm/sec / 5 sec = 2.4cm/sec/sec or 2.4cm/sec^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):
Since it has uniform acceleration(rise/run continually changing but at a uniform rate), then the graph would be increasing at an constant rate in relationship to time, and increasing at a constant rate in relationship to velocity so the graph would be increasing at an increasing rate.
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45 minutes
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&#Very good work. Let me know if you have questions. &#