This is a textbook question, work too !

The force is not pulling in the direction that the box is moving.
Only the force in the horizontal direction does work.
The force in the vertical direction doesn't do any work, because
       the box doesn't move through any vertical distance.

The horizontal force is  200(cos 45°)  =  142 newtons

The vertical force is  200(sin 45°)  =  142 newtons

If you pull the box 5 meters, then the amount of work done is

           (force) x (distance) = (142 N) x (5 m) = 710 joules.

Power  =  (work done) / (time to do the work)

           =  (710 joules)  /  (5 seconds)  =  142 watts .

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