#$&*
course Phy 201
6/8 10:00 pm
If the velocity of the object changes from 4 cm / sec to 16 cm / sec in 8 seconds, then at what average rate is the velocity changing?(16 cm/sec - 4 cm/sec) / 8sec
= 12 cm/sec / 8 sec
=1.5 cm/s/s is the average rate of velocity changing
A ball rolling from rest down a constant incline requires 8.2 seconds to roll the 97 centimeter length of the incline.
• What is its average velocity?
97 cm / 8.2 sec
= 11.83 cm/s is the average velocity
An object which accelerates uniformly from rest will attain a final velocity which is double its average velocity.
• What therefore is the final velocity of this ball?
• What average rate is the velocity of the ball therefore changing?
If the average velocity is 11.83 cm/s and the final velocity is doubled then the final velocity is 23.66 cm/s
The average rate:
(11.83 cm/s)/8.2 sec= 1.44 cm/s/s
An automobile accelerates uniformly down a constant incline, starting from rest. It requires 10 seconds to cover a distance of 132 meters. At what average rate is the velocity of the automobile therefore changing?
132 m / 10 s= 13.2 m/s is the average rate of the automobile changing.
@& That's the average rate of change of the position. Useful in the process, but you've got to find the average rate of change of the velocity with respect to clock time.*@
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