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Phy 121
Your 'cq_1_08.2' 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 ball is tossed upward at 15 meters / second from a height of 12 meters above the ground. Assume a uniform downward acceleration of 10 m/s^2 (an approximation within 2% of the 9.8 m/s^2 acceleration of gravity).
How high does it rise and how long does it take to get to its highest point?
answer/question/discussion: ->->->->->->->->->->->-> :
It rises 20 meters at it's highest point. It takes 1.5 seconds to reach it's highest point.
It will be a bit higher than that; be sure you include the details of your reasoning so I can help you address any errors in your approach.
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How fast is it then going when it hits the ground, and how long after the initial toss does it first strike the ground?
answer/question/discussion: ->->->->->->->->->->->-> :
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18.5 m/s. 3.5 seconds.
At what clock time(s) will the speed of the ball be 5 meters / second?
answer/question/discussion: ->->->->->->->->->->->-> :
1 second
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At what clock time(s) will the ball be 20 meters above the ground? 1.5 seconds
How high will it be at the end of the sixth second?
answer/question/discussion: ->->->->->->->->->->->-> :
It has already hit the ground at six seconds.
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15 minutes
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You haven't explained your thinking, and not all of your answers are correct. Do submit a revision on this one.
&#See any notes I might have inserted into your document. If there are no notes, this does not mean that your solution is completely correct.
Then please compare your 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. &#