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course phy 121
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:
2meters/.64s = a
A = 3.1m/s
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This is average velocity, not acceleration.
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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:
5meters/1.05s=4.8m/s
This is not consistent with te first situation since there is a difference in acceleration of 1.7m/s.
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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:
The first observation is consistent with the accepted value of acceleration of gravity, because if you take the square root of 9.8m/s^2, you get 3.1m/s, which is perfectly consistent with the first observation.
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You've calculated average velocities, but haven't calculated accelerations.
&#See any notes I might have inserted into your document, and before looking at the link below see if you can modify your solutions. If there are no notes, this does not mean that your solution is completely correct.
Then please compare your old and new 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. &#
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