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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The problem:
A ball starts with velocity 0 and accelerates down a ramp of length 30 cm, covering the distance in 5 seconds.
• What is its average velocity?
The average velocity here would be 5 cm in a second.
This isn't far off, but it is not correct.
• If the acceleration of the ball is uniform then its average velocity is equal to the average of its initial and final velocities.
I am not sure here but I know that an object that has an uniform acceleration, the final velocity is double the average velocity.
Very nearly a good statement; you included one of the two essential conditions. You left off the condition that the initial velocity has to be zero.
• You know its average velocity, and you know the initial velocity is zero. What therefore must be the final velocity?
The final velocity is the result of double the average velocity.
• By how much did its velocity therefore change?
The velocity doubled.
You gave a specific answer for the average velocity; not quite correct. However if you correct answer you can give a specific answer to this question. You are right that the velocity doubled, but you can specify what then velocity is.
• At what average rate did its velocity change with respect to clock time?
To get an average rate, we would need two clock time with average rate will have average acceleration.
Good try. You would need the change in clock time and the two corresponding velocities.
• What would a graph of its velocity vs. clock time look like? Give the best description you can.
The graph would be like a line that is gradually increasing and likely be represented by a slope.
Try to be more specific. What is the rise and what does the rise represent? What is the run and what does the run represent?
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It took me about 15 -20 minutes to do so.
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You have made a good effort here, and your answers are at least partially correct, but they did not always include sufficient detail.
&#Please see my notes and submit a copy of this document with revisions and/or questions, and mark your insertions with &&&&. &#