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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 **
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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):
Average velocity = (initial velocity + final velocity) / 2
Average velocity = 7 cm/ sec
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Without further information, why is this just a guess?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
Finding an average is the same for all numbers, including velocities. The two quantities must be added then divided by the total number of data pieces.
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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 = (7 cm/sec) * (3 seconds)
ds = 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):
Velocity changed by 6 cm/second in 3 seconds. So it changed at a rate of 2 cm/second.
@&
That rate would be
(6 cm / sec) / (3 sec)
which gives you 2 cm/sec^2, not 2 cm/sec.
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*#&!
&#Your work looks good. See my notes. Let me know if you have any questions. &#