Phy 201
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: Strictly making a guess I would say that the ball’s average velocity is 7 cm/sec. To come to this conclusion I took the starting velocity (4 cm/sec) and added the ending velocity (10 cm/sec) and then divided their sum by 2, which gave me the 7 cm/sec.
Without further information, why is this just a guess?
answer/question/discussion: Without using any sort of standardized formula for average velocity, I figured the best way to go about this would be just to use a simple formula for finding any type of average.
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: I believe it traveled 6 cm during this time.
At what average rate did its velocity change with respect to clock time during this interval?
answer/question/discussion: I believe it changed at an average rate of 2 cm/sec. I came to this conclusion by using the formula for average velocity. Displacement = (x2 – x1) then (10-4 = 6) then divide that by the time (3 sec) and then you end up with 2 cm/sec.
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15 minutes
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This looks pretty good, but one of your answers is incorrect; in another you have an error in the units.
&#At least part of your solution does not agree with the solution and comments given at the link below. You should view the solution at that link and self-critique as indicated there.
Solution
This link also expands on these topics and alerts you to many of the common errors made by students in the first part of this course. &#