#$&*
PHY 201
Your 'cq_1_02.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** CQ_1_02.1_labelMessages.txt **
The problem:
A ball starts with velocity 4 cm/sec and ends with a velocity of 10 cm/sec.
•What is your best guess about the ball's average velocity?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
(10cm/sec+4cm/sec)/2=7cm/sec
#$&*
•Without further information, why is this just a guess?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
We are not given displacement.
#$&*
•If it takes 3 seconds to get from the first velocity to the second, then what is your best guess about how far it traveled during that time?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
final velocity= 4cm/s
time=3s
(4cm/s-0cm/s)/ 3s=1.3 cm
My best guess is the ball traveled 1.3 cm in the first 3 seconds.
#$&*
@&
There is no reason to expect that the ball is ever moving at 0 cm/s during this interval. It starts at 4 cm/s and ends at 10 cm/s.
If its velocity is never less that 4 cm/s, meaning that it moves no less than 4 cm every sencond, then it will move much further that 1.3 cm in 3 seconds.
*@
@&
Note also that cm / s divided by s is not cm.
*@
*#&!*#&!
@&
You did a good job of explaining your reasoning throughout.
Your last result is not correct, however, so I'm going to ask you to submit a revision.
&#Please see my notes and submit a copy of this document with revisions, comments and/or questions, and mark your insertions with &&&& (please mark each insertion at the beginning and at the end).
Be sure to include the entire document, including my notes. &#
*@