Based on the fact that the box is at rest, the force applied to it, and the frictional force, the net force is 50 N.
The force that is acting on the box at rest will be going in the opposite direction as the frictional force of 200N that is being applied.
When forces are moving in different directions as is the case here, the forces should be subtracted to find the net force.
The net force here is:
= 250 - 200
= 50N
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