Force is a vector quantity hence the net force on the object is 20N.
There are generally two categories of quantities in physics; Vector quantities and scalar quantities.
Vector quantities have both magnitude and direction while scalar quantities have only magnitude and no direction. The direction of a vector quantity is as important as its magnitude. Force, velocity and displacement etc are vectors while mass, temperature, distance etc are scalars
We must take cognizance of the fact that the two forces act in "opposite" directions.
In which case, the net force on the object is; 30 N - 10 N = 20 N
The free body diagram of the object is attached to this answer.
Learn more: https://brainly.com/question/13322477
