A 10 N force and a 15 N force are acting from a single point in opposite directions. What additional force must be added to produce a net force of 0?
5 N acting in the same direction as the 10 N force
5 N acting in the same direction as the 15 N force
10 N acting in the same direction as the 10 N force
25 N acting in the same direction as the 15 N force