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phy231

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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):

7cm/sec

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Without further information, why is this just a guess?

answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):

I'm assuming the acceleration is constant. If the acceleration changes, say at the very end,

it could throw the average way off.

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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):

7cm/sec*3sec=21cm

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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):

(7cm/sec)/3sec=2.33cm/s^2

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