course Phy 121
If the velocity of the object changes from 5 cm / sec to 15 cm / sec in 9 seconds, then at what average rate is the velocity changing?10/9cm/secA ball rolling from rest down a constant incline requires 3.9 seconds to roll the 49 centimeter length of the incline.
• What is its average velocity? About 12.6cm/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? Double the average velocity
This question refers to the same situation as the preceding, and requires a numerical answer with units. The same is the case for the question immediately below this note.
• What average rate is the velocity of the ball therefore changing? Double
An automobile accelerates uniformly down a constant incline, starting from rest. It requires 13 seconds to cover a distance of 110 meters. At what average rate is the velocity of the automobile therefore changing? 8.4m/s
&#This is the average rate of change of position with respect to clock time, i.e., the average velocity. &#