February 23, 2017

Homework Help: Physics

Posted by Einstein on Friday, November 16, 2007 at 5:03pm.

An experimental train has a mass of 1.70e4 kg and is powered across a level track by a jet engine that produces a thrust of 4.90e5 N for a distance of 520 m. a) Find the change in kinetic energy. b) Find the final kinetic energy of the train if it started from rest. c) Find the final speed of the train if there was no friction.

My thoughts: KE = 1/2(m)(v^2). The change in kinetic energy would be the mass of the train times some velocity. But how would you find the velocity?

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