Posted by **Savy ** on Friday, September 9, 2011 at 1:15pm.

A certain car is capable of accelerating at a rate of + 0.30 m/s2. How long does it take for this car to go from a speed of 55 mi/h to a speed of 80 mi/h?

- physics -
**Henry**, Sunday, September 11, 2011 at 4:36pm
Vf - Vo = 80 - 55 = 25mi/h.

25mi/h * 1600m/mi * (1/3600h/s =11.11m/s.

a = (Vf - Vo) / t = 0.30m/s^2,

(11.11) / t = 0.30,

0.3t = 11.11,

t = 37s.

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