course Phy 121
13/Jul/2010 21:17
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):
7 cm/sec
#$&*
*
Without further information, why is this just a guess?
answer/question/discussion (start in the next line):
Elapsed time would be necessary to calculate v_Ave
#$&*
*
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):
3 sec * 7 cm/sec = 21 cm
#$&*
*
At what average rate did its velocity change with respect to clock time during this interval?
answer/question/discussion (start in the next line):
Change in velocity = 10 cm/sec - 4 cm/sec = 6 cm/sec
Average change in velocity = 6 cm/sec / 3 sec = 2 (cm/sec)/sec
#$&*
Copy and paste your work into the box below and submit as indicated:
Your instructor is trying to gauge the typical time spent by students on these questions. Please answer the following question as accurately as you can, understanding that your answer will be used only for the stated purpose and has no bearing on your grades:
* Approximately how much time did you spend on this question?
5 min"
&#This looks very good. Let me know if you have any questions. &#
#$&*