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March 26, 2017

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The speed of the train is reduced from 36 km per hour to 9 km per hour whilst it travels a distance of 150 metres,if the retardation be uniform,find how much further it will travel before coming to rest

  • Physics - ,

    Vo = 36km/h = 36,000m/3600s = 10 m/s.
    V = 9km/h = 9000m/3600s = 2.5 m/s.

    a = (V^2-Vo^2)/2d
    a = (2.5^2-10^2)/300 = -0.3125 m/s^2.

    d = (V^2-Vo^2)/2a
    d = (0-2.5^2)/-0.6250 = 10 m. Further.

  • Physics - ,

    Or:
    d = -(10^2)/-0.6250 = 160 m.

    160 - 150 = 10 m. Further.

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