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course Phy 201
9/25- 12:50
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:
aAve= .64s/2m=.32m/s
acceleration is not `dt / `ds; among other things the units would come out s / m, which is not a unit of acceleration.
a= .32m/s(.64s)=.2058 m/s/s
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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:
aAve= 1.05/5=.21 m/s
a=.21m/s(1.05s)=.2205 m/s/s
They do not have the same acceleration, but that is okay, because the ball that drops farther should have a relatively higher acceleration which it does.
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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:
No, my observations are not consistent with this. I need to further look further into why this may be.
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