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posted by Dwayne on Friday, December 9, 2011 at 8:58pm.

What is a car average acceleration if it slows down from 22ms to 15.7 m/s in 2.15 s?

(15.7-22)/2.15 m/s^2 = -2.93 m/s^2 The minus sign means that it is decelerating.

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