phy 121
Your 'cq_1_05.1' 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 accelerates at 8 cm/s^2 for 3 seconds, starting with velocity 12 cm/s.
• What will be its velocity after the 3 seconds has elapsed?
answer/question/discussion: ->->->->->->->->->->->-> :
12cm+8cm+8cm=28cm/3 sec=9.3cm/sec
I have no idea how to do this problem but I figured if it started out at 12 then the first second it went 12 cm. Then the next 2 seconds it when 16cm (8 each cm). So if I add them all up I get 28cm and then divide by 3 gives me 9.3cm/sec as the velocity.
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• Assuming that acceleration is constant, what will be its average velocity during this interval?
answer/question/discussion: ->->->->->->->->->->->-> :
vAve=(vf-v0)/2
(12cm/s-8cm/sec)/2= 2cm/sec
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• How far will it travel during this interval?
answer/question/discussion: ->->->->->->->->->->->-> :
12cm+8cm+8cm=28cm
During a 3 second interval it will travel 28cm. During the first second it went 12cm and then during the second two seconds it when 16 cm (8 each second).
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220 min
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to
&#See any notes I might have inserted into your document. If there are no notes, this does not mean that your solution is completely correct.
Then please compare your solutions with the expanded discussion at the link
Solution
Self-critique your solutions, if this is necessary, according to the usual criteria. Insert any revisions, questions, etc. into a copy of this posted document. Mark any insertions with &&&& so they can be easily identified.If your solution is completely consistent with the given solution, you need do nothing further with this problem. &#
As is the case with most Principles of Physics students at this point, you sometimes make errors in applying the definitions, and/or identifying clock times and time intervals, velocities, changes in velocity, etc..
This is a challenging task, which is why it is spread out over a number of assignments.
I recommend that you run through and submit all or part of the following exercise, which I believe you will find very helpful:
http://vhcc2.vhcc.edu/dsmith/GenInfo/qa_query_etc/ph1/ph1_asst_2_supplementary_questions.htm.
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