Carly H.

asked • 06/05/20# Mrs. Baker is driving her Ford Fiesta at a rate of 70 mi/hr. What is her acceleration if it takes her 4 seconds to come to a complete stop?

** ****a = vf – vi vf = vi + at t = vf-vi**

** t a **

**these are the formulas i was given im not sure which one to use or even how to do this.**

**Find the acceleration**

## 1 Expert Answer

v = v_{0} + at. From here a = (v - v_{0})/t.

By condition v = 0, v = 70mi/hr = 70·1609.34m/3600sec = 31.3m/sec; t = 4 sec;

a = (0 - 31.3m/sec)/4sec = - 7.823 m/sec^{2}.

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Ronn K.

06/05/20