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Phy 121
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.
** CQ_1_02.1_labelMessages.txt **
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):
2.5 cm / sec
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The minimum verlocity is 4 cm/s and the max is 10 cm/s. So the average could not be 2.5 cm/s.
The above is the best feedback I can give you on this. You don't explain your reasoning, so I can't identify the nature of your error or do any more to help you correct it.
Note that you always need to document your thinking, which reinforces it for you and allows me to offer more help when you miss the mark.
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Without further information, why is this just a guess?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
It is a guess because you do not know how far it really traveled
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It's better than a guess, but you do need to make some reasonable assumptions that might or might not prove to be correct.
You are correct that you would need the distance and the time interval to get an accurate result for the average velocity.
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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):
It traveled about 6 cm
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The average velocity you gave, 2.5 cm/s, isn't a reasonable result. However, based on that result, you would not get 6 cm for the distance traveled in 3 seconds.
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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):
'ds = vAve * 'dt
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That is correct. If you applied that with average velocity 2.5 cm/s and time interval 3 s, what would you get?
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