The magnitude and direction of the resultant force is 15 N towards the John
What is reaction force?
It is a type of force that acts in the opposite direction of the applied force, for example when one applies active force towards the stationery wall, the wall exerts a reactive force in the opposite direction.
As given in the problem John and Rob are engaged in a tug of war. John is pulling with a force of 230N, and Rob is pulling with a force of 215N.
resultant force = 230 -215
= 15 N
The direction of the resultant force would be toward the John
Thus, The magnitude and direction of the resultant force is 15 N toward the John
Learn more about reaction forces here
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