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Phy 231
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: ->->->->->->->->->->->-> scussion:
vAve=`ds/`dt
vAve=2meters/.64seconds
vAve=3.125m/s
3.125=(v0+vf)/2
vf=6.25
Velocity changes from 0 to 6.25m/s in .64s
a=`dv/`dt
a=6.25m/s/.64s
a=9.77m/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: ->->->->->->->->->->->-> scussion:
vAve=`ds/`dt
vAve=5m/1.05s
vAve=4.76m/s
4.76=(v0+vf)/2
vf=9.52
a=`dv/`dt
a=9.52m/s/1.05s
a=9.06m/s^2
The two accelerations of 9.77m/s^2 and 9.06m/s^2 are fairly close; probably within a reasonable uncertainty of measurement of one another.
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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: ->->->->->->->->->->->-> scussion:
Yes, these values are reasonably consistent with the accepted value of the acceleration of gravity.
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*#&!
&#Good responses. Let me know if you have questions. &#