F2 equals 4 N and F4 equals 6 N. The correct option is D.
What are collinear forces?
Collinear forces are those that act in the same line for a system when their lines of action are aligned. A force is an effect that can alter an object's motion according to physics.
An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.
Given that four forces are exerted on a box. If F1 equals 4 N and F3 equals 6 N and the box remains stationary.
To make the box stationary the value of the forces  F2 equals 4 N and F4 equals 6 N. This will make the equilibrium of the forces.
Therefore, Â the force F2 equals 4 N and F4 equals 6 N. The correct option is D.
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