Phy 121
Your 'cq_1_03.1' 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 starts with velocity 0 and accelerates uniformly down a ramp of length 30 cm, covering the distance in 5 seconds.
• What is its average velocity?
answer/question/discussion: ->->->->->->->->->->->-> :
30cm / 5 s = 6 cm/s
• If the acceleration of the ball is uniform then its average velocity is equal to the average of its initial and final velocities.
You know its average velocity, and you know the initial velocity is zero.
What therefore must be the final velocity?
answer/question/discussion: ->->->->->->->->->->->-> :
12 cm/s (6 * 2)
• By how much did its velocity therefore change?
answer/question/discussion: ->->->->->->->->->->->-> :
In the 5 seconds the object went from 0 to 12 cm/s.
• At what average rate did its velocity change with respect to clock time?
answer/question/discussion: ->->->->->->->->->->->-> :
It gains an average of 2.4 cm/s/s
• What would a graph of its velocity vs. clock time look like? Give the best description you can.
answer/question/discussion: ->->->->->->->->->->->-> :
The line would be linear with a slope of 12/5 (the same as the average rate), starting at 0 and continuing up to 12 cm/s at 30cm.
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15 minutes
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&#This looks very good. Let me know if you have any questions. &#