Phy 231
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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?
10 + 4 = 14 / 2 = 7 The ball had an average velocity of 7 cm / s.
• Without further information, why is this just a guess?
This would be my best guess because it is the average of the
beginning and ending velocities.
• 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?
My best guess would be that the ball traveled 28 cm because now that
we have a time interval to fit the beginning and ending times we can
estimate at if there was uniform acceleration the velocity at the
given seconds. (0,4) (1,6) (2,8) (3,10) Sum up the “Y’s” to get
28.
• At what average rate did its velocity change with respect to
clock time during this interval?
The object went from 4 cm/s to 10 cm/s over 3 seconds. The difference
between the ending rate and the beginning rate is 6 cm/s divide that
by 3 seconds to get an average rate of 2 cm/s.
@& Your reasoning is good but your units are incorrect.*@
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10 minutes
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