Answer :
The net force ∑F is 250 N.
A net force is what?
The net force acting on an object is the result of all pushing and pulling forces acting on the object collectively (the sum). If there is an imbalance in the pushing and pulling forces acting on an object, the object will accelerate in the direction of the net force.
According to Newton's second law, an object's acceleration is inversely proportional to its mass and proportional to both the resultant force and the resultant force.
∑F = m×a
a = ∑F/m
When an object falls in the air, friction with the air and gravity are both at work because of the mass of the object.
These two forces operate in opposition to one another. Gravity is downward while the frictional force is upward.
Fg = m×g
Fg = 30×10
Fg = 300N
Fa = 50N
So that the object is affected by the net force
∑F = Fg - Fa
∑F = 300 - 50
∑F = 250 N.
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