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## Homework Statement

a shunting locomotive strikes a wagon of mass 8t and sets it in motion with an initial speed of 3.6m/s.The wagon travels freely along a level track against a track resistance of 58N/t for 12s.determine;

a.the frictional resistance(average force)

b.the reduced velocity of the wagon after the 12s due to the track resistannce

Please i need some one to help me figure out what to do first to start with this question..I'm not asking for answers,just want step by step procedure so i can get to understand this topic once and for all.:)

## Homework Equations

F=Δmomentum(??)/time

struggling with how to find the change in momentum.:(