Force problem (whoever answers correct will be rewarded a cookie )

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lorik
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Homework Statement


Train with mass m=6*105kg moves with a constant speed of v=54km/h.After the engine shut down ,train stops in t=40s .Find the average force train performs before engine shut down?


Homework Equations


I think its asking for Force ? if yes will this equation below do ?


The Attempt at a Solution



F=m/t*(mv2/2)

I could be so wrong like GIGANTIC WRONG please braniacs reveal your wisdom on this very rough moment for me !
 

Discussion

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What's F=m/t*(mv2/2)? Force certainly isn't equal to power times mass.

This is just a kinematics problem. Can you find the train's acceleration? If so, you can find the force using F=ma.