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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):
v_1 = 4 cm/s
v_2 = 10 cm/s
V = delta(s)/delta(t)
or in this case
v_avg = (v_1 + v_2) / 2
= 7 cm/s
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Without further information, why is this just a guess?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
because v_avg = (v_1 + v_2) / 2 I averaged an average. The real equation is V_avg = delta(s)/delta(t)
and we don't know the time it took to get to 10 cm/s
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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):
'dt=3 s
v_avg = 7 cm/s
distance traveled = v_avg * 'dt = 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):
a = 'dv / 'dt
a= (v_2 - v_1) / 'dt
(10cm/s - 4 cm/s) / 3 s = 2 cm/s^2
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*#&!
&#Very good responses. Let me know if you have questions. &#