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.
** **
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?
oIt increased by 6 cm/sec over time, most likely from rolling down a slope. The average velocity changes, but my best guess is that the average velocity is about 7 cm/sec.
•Without further information, why is this just a guess?
oThis is a guess without further information because without knowing the distance it was rolled, or how long the sample was taken, then you have nothing to base an answer off of. I had to simply average the two velocities together by adding them and dividing by two.
-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?
o6 cm/sec * 3 seconds= 18 cm
I would say that it traveled 18 cm.
change in position = ave rate of change of position with respect to clock time * change in clock time, which is the same as average velocity * change in clock time.
6 cm/s is the change in velocity. While multiplying average velocity by change in clock time gives you change in position, multiplying change in velocity by change in clock time doesn't give a meaningful result.
What therefore is the change in position?
•At what average rate did its velocity change with respect to clock time during this interval?
oIt increased by 6 cm/sec from when one velocity was measured to the other.
What is the definition of average rate of change of velocity with respect to clock time?
What is the change in velocity?
What is the change in clock time?
What therefore is the average rate of change of velocity with respect to clock time?
** **
15 minutes
** **
You've almost got it, but you need to be a little more careful with the definitions. See my notes.
&#Copy this question into a text editor or word processor, insert your answers to my questions, any revisions you find necessary, and/or questions of your own, and mark your insertions with &&&&. Then submit using the form for this seed question.
&#