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Homework Help: physics

Posted by Tamera on Friday, September 7, 2012 at 12:20am.

A certain car is capable of accelerating at a rate of + 0.80 m/s2. How long does it take for this car to go from a speed of 15 mi/h to a speed of 75 mi/h?

• physics - Henry, Saturday, September 8, 2012 at 8:21pm

  Vo = 15mi/h * 1h/3600s * 1600m/mi=6.67 m/s = Inital velocity.
  
  Vf = (75/15) * 6.67m/s = 33.33 m/s. = Final velocity.
  
  t=(Vf-Vo)/a=(33.33-6.67) / 0.80=33.1 s.
  

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