Answer:
Magnitude of the resultant force will be 20N in the direction of 
.
Step-by-step explanation:
It's given in the question that two forces have been applied on the object given.
Since force is a vector quantity, therefore, it has magnitude and direction both. 


Both the forces are in the opposite directions.
Therefore, magnitude of the resultant force of these forces will be,

 = 20 N
And the direction of the resultant force will be towards 
. 
Therefore, magnitude of the resultant force will be 20N in the direction of 
.