Find net force, given velocity?

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JettyZ
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Homework Statement


hwkb42.jpg

Homework Equations


The Attempt at a Solution


a)
Fnet=(2250cos(35)) * 2 - 1250
Fnet=+593 N [E]

b)
I have solved part a, but I don't understand how to approach part b.
 
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The problem apparently means that the barge is later moving at a constant velocity of 2.5 m/s [E].