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____

Answer 1

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

Answer 2

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

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