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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 speed would be the same. Since gravity’s acceleration is constant and is conservative everything and the distance traveled up and down is the same v0 for the throw and vf for the fall would be the same, just like vf_throw and v0_fall would be the same at 0m/s.
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• What, if anything, is different in your answer if air resistance is present? Give your best explanation.
answer/question/discussion: ->->->->->->->->->->->-> :
Air Resistance is non-conservative and like any other such force, friction for example, it will leach energy from the system. This means that, since the distance of the rise and fall would be the same, the final velocity would be slower.
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about 5 minutes
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&#Very good responses. Let me know if you have questions. &#
Phy 241
Your 'cq_1_21.2' 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 typical automobile coasts up a typically paved incline, stops, and coasts back down to the same position.
• When it reaches this position, is it moving faster, slower or at the same speed as when it began? Explain
answer/question/discussion: ->->->->->->->->->->->-> :
If there is no friction or wind resistance, only the horizontal component of gravity, then the speed would be the same. In the real world, the speed would be slower as friction and gravity remove some energy from the system.
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&#Very good responses. Let me know if you have questions. &#