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Phy 241
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):
My best guess would be the average of the given velocities. That is, (4 + 10)/2 = 7 cm/sec.
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• Without further information, why is this just a guess?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
Because it assumes that the increase from 4 m/s to 10 m/s was linear. We were not given any other instantaneous velocities during the time period, or information on which to base a weighted 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):
If it traveled at an average velocity of 7 cm/sec for 3 seconds, I’d guess that it travelled 7 cm/s * 3 sec = 21 cm.
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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):
It went from 4 cm/s to 10 cm/s in a period of 3 seconds - so it changed 6 cm/s in a period of 3 seconds for an average rate of velocity change of (6 cm/sec) / (3 seconds) = 2 cm/sec².
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10 minutes
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7/10 15:25
&#Very good responses. Let me know if you have questions. &#