course Phy121
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?vvvv
vAve= 12cm/8sec=1.5cm/sec
12 cm is not the displacement on this interval
12 cm/s is the change in velocity, and if you divide this by 8 seconds you get the average acceleration on the interval; however the units would be different than those you give above.
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?
97cm/8.2sec = 11.8cm/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?
23.6cm/sec
• At average rate is the velocity of the ball therefore changing?
I am not sure what information that you are wanting here to find the solution.
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?
132m/10sec = 13.2m/sec.
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