Answer:
The net horizontal force is zero.
Step-by-step explanation:
When an object is in the air, the primary force acting on the object will be the gravitational force, which pulls the object down to the ground.
There is also air resistance, a force that depends on the shape and velocity of the object, and can be ignored.
So, once the ball is already kicked and is in the air, the only force acting on the ball will be the gravitational force, which is a vertical force.
Thus, there is not a horizontal force.
Then the net horizontal force is zero, if we are ignoring the air resistance.