course phy201
6/17 7
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?16cm-4cm= 12cm
12cm/8sec= 3cm/2sec=1.5 cm/sec
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 centimeters/ 8.2 seconds = 11.83 cm/sec
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?
11.83 * 2= 23.66 cm/sec
What average rate is the velocity of the ball therefore changing?
you should have a numerical answer here
The fact that the velocity doubles at the end of the 97 cent. length does not change the average velocity of 11.83cm/sec.
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 meters/ 10 seconds = 13.2 m/s
This is the average rate of change of position with respect to clock time, not the average rate of change of velocity with respect to clock time.
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