#$&*
Phy 201
Your 'cq_1_02.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
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The problem:
A ball starts with velocity 4 cm/sec and ends with a velocity of 10 cm/sec.
• What is your best guess about the ball's average velocity?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
I would guess that the average velocity was about 6cm/sec. (10cm-4cm/sec= 6cm/sec).
#$&*
@& If the ball started at 2 cm/s and ended up at 60 cm/s, you wouldn't conclude that the average velocity was 58 cm/s. What you have calculated is the change in velocity, which is not directly related to the average velocity.*@
• Without further information, why is this just a guess?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
This is just a guess because I would really need the starting distance, ending distance, starting time and ending time to get a true measurement of rate.
#$&*
@& Good. That information would suffice to calculate the average velocity.*@
• If it takes 3 seconds to get from the first velocity to the second, then what is your best guess about how far it traveled during that time?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
I would guess that it traveled 18 cm during that time. (6cm/sec *3sec= 18cm).
#$&*
@& If the ave vel was 6 cm/s this would be correct.*@
@& 6 cm is not a given quantity. There is no cm position, nor is there a 6 cm displacement, which corresponds to the interval being considered.
*@
• At what average rate did its velocity change with respect to clock time during this interval?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
The velocity changed at an average rate of 2cm/sec. (6cm / 3 sec= 2cm/sec.).
#$&*
*#&!
@& You have a couple of errors here, though you are on the right track. Don't spend a lot of time on a revision, but see if you can get it in 15 minutes or so. If not, tell me what you do and do not understand and ask for more guidance.
&#Please see my notes and, unless my notes indicate that revision is optional, submit a copy of this document with revisions 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.
If my notes indicate that revision is optional, use your own judgement as to whether a revision will benefit you. &#
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