Understanding the Forces

* Weight (Force of Gravity): The 20 N force is the object's weight, acting downwards due to gravity.

* Air Resistance: The 4 N force is air resistance, acting upwards, opposing the object's motion.

Calculating Net Force

Net force is the vector sum of all forces acting on an object. Since the forces are in opposite directions:

* Net Force = Weight - Air Resistance

* Net Force = 20 N - 4 N

* Net Force = 16 N

Answer: The magnitude of the net force on the object is 16 N.