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You have calculated the slope of the position vs. clock time trapezoid.
However the slope of that trapezoid is not the acceleration. The acceleration would be the slope of the v vs. t trapezoid.
You also left the units out of your calculation.
-2 m / (0.64 s) gives you -3.1 m/s, not -3.1 m/s^2.
The units, used throughout the calculation, would have alerted you to the fact that you had not calculated an acceleration.
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phy121
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 **
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: ->->->->->->->->->->->-> :
rise= -2m
run= 0.64s
-2/0.64= -3.125m/s^2
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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: ->->->->->->->->->->->-> :
rise= -5m
run= 1.05s
-5/1.05= -4.76m/s^2
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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: ->->->->->->->->->->->-> :
My values are negative to denote that it is falling. However, my calculations of the balls being dropped are slower than the accepted value for gravity. I found 3.125m/s^2 and 4.76m/s^2, which is less than half of the accept value, which shows that the balls are moving slower than the accept value for gravity.
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You haven't calculated your accelerations correctly.
Check my note on your first calculation, and see if you can get the correct acceleration in 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. &#
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