phy 201
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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The problem:
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/5s=6cm/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+0=12/2=6 so the final velocity would be 12 cm/s
• By how much did its velocity therefore change?
answer/question/discussion: 12cm/s
• At what average rate did its velocity change with respect to clock time?
answer/question/discussion: 12cm/s/5s=2.4
• What would a graph of its velocity vs. clock time look like? Give the best description you can.
answer/question/discussion: Slope would be positive, and it would be a straight line
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15 minutes
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I wasn't sure if I submited this last week or not; it wasn't on my access page, so I am submitting it now, just in case.
I remember seeing it last week; it's possible that it was posted to your Spring 09 access site. I've changed the codes files so this shouldn't happen again. In any case your work is, and was, fine on this problem.