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In the 1950s, an experimental train that had a mass of 2.65 104 kg was powered across a level track by a jet engine that produced a thrust of 5.25 105 N for a distance of 509 m. Assume that air resistance is negligible.

(b) Find the change in kinetic energy.
(c) Find the final kinetic energy of the train if it started from rest.
(d) Find the final speed of the train if there had been no friction.

  • Physics -

    (b) Work done = Force x distance
    (c) same as (b)
    (d) sqrt [2*(K.E)*M]

  • Physics -

    There is an error in the form for question (d)

    vf = sqrt [2*(K.E)/M]

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