Homework Help: physics

Posted by alexa on Tuesday, June 14, 2011 at 12:11am.

If a car completes a 3.8 mi oval track in 69.7 s, what is the average speed? answer in mph

Did the car accelerate? (A.yes the direction of the motion changed or B. yes the speed changed or C. no the speed didnt change)

physics - drwls, Tuesday, June 14, 2011 at 7:18am
The average speed is 3.8/69.7 = 0.054519 miles per second. Multiply that by 3600 sec/hr for mph.

I get 196.3 mph

Yes of course the cart had to accelerate on the turns. That does not mean the speed had to change (although it probably did)

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