Question

A feather of mass 5 gm is dropped from a height. It is observed to fall down with a constant
velocity. What is the net force acting on it?

Answer 1

Since....a feather of 5 g has been dropped from a height. When a feather falls down in presence of air with a constant velocity, no net force acts on it. The downward force due to gravity is nullified by the air-drag in the upward direction. So, there is no net acceleration of the feather and hence no net force acting on it.

Answer 2

Answer:

Since velocity is constant

acceleration will be zero because acceleration = change in velocity divided by time

since there is no change in velocity acceleration is zero

we know force = mass * acceleration

since acceleration is zero

so,

gravity won't act.

so this would be a free fall and

force acting will be zero