If the velocity of the object changes from 2cm/s to 14 cm/s in 11 sec. then at what average rate is the velocity changing? 1.09
A ball rolling from rest down a constant incline requires 7 sec to roll the 93 cm length of the incline.
What is its average velocity? about 13 cm/sec
An object which accelerates uniformly from rest will attain a final velocity which is double its original velocity.
What therefore is the final velocity of this ball? 26 cm/s
What average rate is the velocity of the ball therefore changing? 2cm/sec
You need to show how you use the given information to get each result. The 13 cm/s and 26 cm/s are correct, but the 2 cm/s answer is not, and it's not clear how you got that.
Please resubmit and explain your work on that step; also get in the habit of documenting the process by which you arrive at all answers.
An automobile accelerates uniformly down a constant incline, starting from rest. It requires 14 sec to cover a distance of 107 meters. At what average rate is the velocity of the automobile therefore changing? 7.6 meters/sec.
This is the average velocity, but not the average rate at which velocity is changing.
The solution of this problem will follow the same reasoning process as in the previous series of questions.