idk how to dothe last three! HELP PLZ, DUE TOMORROW this is the question ... In

Question

idk how to dothe last three! HELP PLZ, DUE TOMORROW

this is the question ...

In the 1950s, an experimental train, which held a mass of 2.50 x104 kg, was powered across a level track by a jet enginethat produced a thrust of 5.00 x 105 N for a distance of509m.

a) Find the work done on the train.
      i got this one to be 2.55 x108 J.

b) Find the change in Kinetic energy.
c) Find the final kinetic energy of the train if it started fromrest.
d) Find the final speed of the train if there had been nofriction.

idk how to do the last three! HELPPLZ, DUE TOMORROW

Explanation / Answer

(B): From the work-energy theorem, work done is equal to change inKE, so: -- W = KE = KE(f) - KE(i) = 2.55*10^8 J -- -- (C): Since the train started from rest, the intial KE is zero, sothe final KE is: E = KE(i) + KE(f) = 2.55*10^8 J -- -- (D): 1/2mv^2 = 2.55*10^8 v = (2.55*10^8 / 1.25*10^4) v = 143 m/s -- -- Hope this helps.

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