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Math Help - A train problem

  1. #1
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    A train problem

    A train of mass 200,000kg makes a journey on a straight track.
    First stage – the train moves with constant acceleration starting at rest and reaching speed of 25ms when it has travelled 0.25km.
    Second stage – the train travels 11.25km at a constant speed of 25ms
    Third stage – the train has constant deceleration and comes to rest in 40s.
    Find the acceleration in the first stage? for this I got 1.25 m/s/s
    Find the total distance travelled?
    The resistance to motion is modelled as a constant force of magnitude 100000N throughout each stage of the journey. Find the driving force produced by the train’s engine during the first stage.?
    Any help would be fab thanks J
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    Quote Originally Posted by gracey View Post
    A train of mass 200,000kg makes a journey on a straight track.
    First stage – the train moves with constant acceleration starting at rest and reaching speed of 25ms when it has travelled 0.25km.

    Second stage – the train travels 11.25km at a constant speed of 25ms

    Third stage – the train has constant deceleration and comes to rest in 40s.

    Find the acceleration in the first stage? for this I got 1.25 m/s/s ok

    Find the total distance travelled? 0.25 km + 11.25 km + distance of stage 3

    distance in meters ... \textcolor{red}{d = \frac{1}{2}(v_f + v_0)t}

    The resistance to motion is modeled as a constant force of magnitude 100000N throughout each stage of the journey. Find the driving force produced by the train’s engine during the first stage.?

    F{net} = ma

    let F = train's driving force

    F - 100000 = (200,000 kg)/(1.25 m/s/s)

    .
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