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.

Question

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.
  J____
(c) Find the final kinetic energy of the train if it started from rest.
  J____
(d) Find the final speed of the train if there had been no friction.
  m/s____

drwls · Answer

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

Rafael · Answer

There is an error in the form for question (d) vf = sqrt [2*(K.E)/M]