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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):
the average velocity is found by averaging the initial and final velocities so (10cm + 4cm) / 2 sec = 7 cm / sec
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• Without further information, why is this just a guess?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
we need to have the change in position and the change in time to accurately detail the average velocity. The average of the initial and final velocities is a more rough estimate.
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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):
`ds = vAve (7cm / sec) * `dt (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):
the average rate at which the velocity changed or the acceleration is aAve= `dv (10cm / sec - 4cm / sec = 6cm/sec) / `dt ( 3 sec) = 2cm/sec^2
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*#&!
&#This looks very good. Let me know if you have any questions. &#