# Which of the following is NOT an example of acceleration?

## $$A. a car going from 10 mi/hr to 20 mi/hr B. a bicyclist turning around the corner C. a car traveling north with its cruise control set D. a car slowing down to stop at a stop sign 

Feb 12, 2018

Only C.

#### Explanation:

Cases A. and D. are obviously acclerating (D is decelerating, which is only negative acceleration).

Case B is acceleration. Changing the direction of an object's trajectory requires acceleration.

Leaving case C. A car with it's cruise control set, traveling in a constant direction at a constant speed, is not accelerating.

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