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course phy 201
3/20 11:30am
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?15-5=10
Average rate of velocity change = 10cm/s/9s or 1.11cm/s/s
A 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?
49cm/3.9s
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?
(49/3.9)*2=
98cm/3.9s
• What average rate is the velocity of the ball therefore changing?
(98cm/3.9s)/3.9s = 6.4cm/s/s approx.
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?
Average velocity:
110m/13s
Final velocity:
(110/13)*2=
220m/13s
Average change in velocity:
(220m/13s)/13s = 1.3m/s/s
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&#Very good responses. Let me know if you have questions. &#