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  ewka13 10.1.2011 (11:43)

  m = 900t = 900 000kg
  t = 3min = 3*60s = 180s
  v = 90km/h = 90*\frac {1000m} {3600s} = 25m/s
  
  v_{o} = 0
  
  v = at \Rightarrow a = \frac {v} {t}
  
  a = \frac {25m/s} {180s} = 0,14m/s^{2}
  
  F = m*a
  F = 900 000kg*0,14m/s^2=126000N
  
  s = \frac {1} {2}at^{2}
  
  s = \frac {1} {2}*0,14m/s^{2}*(180s)^{2} = 2268m
  
  W = F*s
  W = 126000N*2268m=285768000J=285768kJ
  
  P = \frac {W} {t}
  
  P = \frac {285768kJ} {180s} =1587,6kW
  
  Moc lokomotywy wynosi 1587,6 kW.

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