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:
Answer: I am guessing that the average velocity of the ball is 7 cm/sec because it is halfway between 4 and 10.
• Without further information, why is this just a guess?
answer/question/discussion:
Answer: This is just a guess because we have no idea how long the ball traveled at 4 cm/sec or 10 cm/sec. For example, it could have traveled 4 cm/sec for the majority of the trial in which case the average velocity would be lower than 7 cm/sec.
• 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:
Answer: I am guessing it traveled 21 cm because average velocity might have been 7 cm/sec, and it traveled for 3 sec, 7 cm/sec * 3 sec = 21 cm.
• At what average rate did its velocity change with respect to clock time during this interval?
answer/question/discussion:
Answer: 10 – 4 = 6 cm/sec, so the average rate of velocity changed with respect to clock time is: 6/3 = 2 cm/sec.
6/3 is not an appropriate calculation. 6 cm/s / (3 s) is, but while your numerical result is correct, your units are not. Please revise to show the correct details of the units calculation.
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15 minutes
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Overall very good, that you did not use units correctly in that last calculation. It should just taking a minute to fix this, but it needs to be corrected.
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