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phy 121
Your 'cq_1_07.1' 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_07.1_labelMessages **
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A ball falls freely from rest at a height of 2 meters. Observations indicate that the ball reaches the ground in .64 seconds.
Based on this information what is its acceleration?
answer/question/discussion: ->->->->->->->->->->->-> :
If the ball goes from rest at 0m/s to 2 meters in .64 seconds or 3.1 m/s we have a change in velocity of 3.1 m/s, which if divided by the change in time .64 seconds, reveals our average acceleration at 4.9 m/s/s
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3.1 m/s is the average velocity, not the change in velocity.
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Is this consistent with an observation which concludes that a ball dropped from a height of 5 meters reaches the ground in 1.05 seconds?
answer/question/discussion: ->->->->->->->->->->->-> :
The change in velocity would by 4.7 m/sec / 1.05 sec to give an aAve of 4.5 m/s/s which is not consistent with the previous information
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Are these observations consistent with the accepted value of the acceleration of gravity, which is 9.8 m / s^2?
answer/question/discussion: ->->->->->->->->->->->-> :
It appears so far that the observations are not consistent with the accepted value of the acceleration of gravity
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about 15 minutes
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You are using the average velocity where you should be using the change in velocity.
Otherwise OK, but this needs to be corrected.
&#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. &#
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