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pHY 231
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.
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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):
The avg. velocity is 7 cm/sec.
(4cm/sec + 10 cm/sec) / 2 = 7 cm/sec avg.
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Without further information, why is this just a guess?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
This is just a guess due to the fact that you’re only averaging the 2 numbers instead of putting their position and time values into a formula to solve for avg. 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):
Using our guess for avg. velocity, it would have traveled 21 cm in order to get from the 1st velocity to the 2nd.
7 cm/sec * 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):
(Final vel. - initial vel.) / time elapsed = avg. rate
10 cm/sec - 4 cm/sec = 6 cm/sec
(6 cm/sec) / 3 sec = 2 cm/sec/sec
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&#Very good responses. Let me know if you have questions. &#