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A parachute on a racing dragster opens and changes the speed of the car from 85 m/s to 45 m/s in a period of 4.5 seconds. What is the acceleration of the dragster?

 Jan 25, 2019
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Acceleration is change in velocity over time.  In this example it will be a NEGATIVE acceleration as the car slows.

 

(Vf-Vo ) /  time   =  (45 - 85 m/s) / 4.5 s =  - 8.89 m/s^2

 Jan 25, 2019
edited by ElectricPavlov  Jan 25, 2019

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