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: 30 cm/ 5 sec = 6 cm/sec
• 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: I would assume that you add the initial velocity to the average velocity and then multiply that by the time it takes to cover the distance. In that case you would have: 0+6 (5) = 30 cm/sec
if you know the average of two numbers, and you know one of the numbers, then how do you find the other?
• By how much did its velocity therefore change?
answer/question/discussion: 24 cm/sec
• At what average rate did its velocity change with respect to clock time?
answer/question/discussion: 24 cm/sec / 5 sec = 4.8 cm/sec
• What would a graph of its velocity vs. clock time look like? Give the best description you can.
answer/question/discussion: This graph would be increasing at an increasing rate.
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15 minutes
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&#At least part of your solution does not agree with the solution and comments given at the link below. You should view the solution at that link and self-critique as indicated there.
Solution
This link also expands on these topics and alerts you to many of the common errors made by students in the first part of this course. &#