The additional force must be added to produce equilibrium is 5 N force acting in the same direction as the 10 N force (Option A)
To have equilibrium,
Force to the left = force to the right
But
The force to the right is greater than the force to the left.
Thus,
Force to the left + additional force = force to the right
10 + additional force = 15 N
Collect like terms
Additional force = 15 - 10
Additional force = 5 N
Therefore, an additional force of 5 N acting in the same direction of the 10 N force is needed to obtain the equilibrium of the system (Option A)
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