Question

What is the net force on this object?

Answer 1

The net force is the sum of all the forces acting in a particular direction. In the vertical direction, there are two forces acting. One acts upwards (I would give this a positive sign) and one acts downwards (I would give this a negative sign). What do you get when you add them together?

Answer 2

using Newton's law to set it up; \[\sum F = ma \implies F_{air}+F_{gravity} = ma\] what does Newton's third law tell us now?