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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):
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30/5= 6
6 cm/sec= average velocity
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?
= (the initial velocity + average velocity)/2
= (0 + 6)/2
= 3 cm/s
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At this point you are saying that the initial velocity is 0 cm/s, the average velocity is 6 cm/s and the final velocity is 3 cm / s.
If the initial and final velocities are 0 cm/s and 3 cm/s, what is the average velocity? Note that the average velocity is between the initial and final velocities.
How does this result lead to a contradicion with the given information?
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Is going on average 6 cm/sec and it covers 30 cm in 5 seconds. So if it is going 6 cm per second it would be 30 cm/s for the final.
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If it started at 0 cm/s and ended up at 30 cm/s, what would be the average?
Note that the average is 6 cm/s. Is this consistent with initial and final velocities 0 cm/s and 30 cm/s?
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answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
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By how much did its velocity therefore change?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
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Change in initial and final velocities: 0 and 30= 30 cm/s
At what average rate did its velocity change with respect to clock time?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
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It went from 0 to 30 in 5 seconds.
Changed on average 30/5= 6 cm/s
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):
It would increase at an increasing rate
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20 minutes
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There are some inconsistencies in your results, which I've pointed out in inserted notes.
Spend up to 20 minutes trying to work out those contradicions, apply the definitions, etc., the submit your best revision according to my instructions below.
&#Please see my notes and submit a copy of this document with revisions, comments 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. &#
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