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PHY 241
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** CQ_1_02.1_labelMessages.txt **
The problem:
A ball starts with velocity 4 cm/sec and ends with a velocity of 10 cm/sec.
What is your best guess about the ball's average velocity?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
vAve = v_f - v_0 = 10 - 4 = 6 cm/sec
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v_f - v_0 is the change in velocity, not the average velocity.
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Without further information, why is this just a guess?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
This is just a guess, because we don't know that the ball is accelerating uniformly over the entire interval
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If it takes 3 seconds to get from the first velocity to the second, then what is your best guess about how far it traveled during that time?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
`ds = vAve * `dt = (6cm / sec) * 3 sec = 18 cm
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At what average rate did its velocity change with respect to clock time during this interval?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
`dv = vAve / `dt = (6 cm/s) / (3 s) = 2 cm/s^2
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Good try, but you have confused average velocity and change in velocity so most of your results are invalid.
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