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Phy 241
Your 'cq_1_21.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
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A ball is tossed vertically upward and caught at the position from which it was released.
Ignoring air resistance will the ball at the instant it reaches its original position be traveling faster, slower, or at the same speed as it was when released?
answer/question/discussion: ->->->->->->->->->->->-> :
the only forces on the ball are the intial force of the ball thrown up in the air and the gravitational force.
There is no air resistance, friction or any other forces.
And the conservation of energy shows us that no energy is lost in the act of throwing the ball up and down.
At the peak when the ball begins to come back down, KE is used all up and become PE, and when it comes back down, the same amount of energy is
created
So if there is no energy loss and the only forces on the ball is gravity, than the ball neither gains or loses speed.
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What, if anything, is different in your answer if air resistance is present? Give your best explanation.
answer/question/discussion: ->->->->->->->->->->->-> :
If air resistance is present, it acts as another force on the ball and energy is lost. So the amount of energy the ball starts off with is not
the same amount of energy
is ends up with, so therefore the ball would be traveling at a slower speed, because it has less energy to climb in to air and on the way back
down has less distance for gravity to accelerate it.
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&#Very good responses. Let me know if you have questions. &#