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Homework Help: physics

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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