Can someone Please Help!!

If the ball is accelerating down through the air with no horizontal motion, the net forces acting on the ball must follow: C. The gravitational force is greater than the drag.

Explanation:

This is because the gravitational force is directed downward and the drag force opposes the direction of motion (therefore the drag force is directed upwards).  Since the ball is accelerating downwards, the gravitational force must be greater than the drag force in order to create this acceleration.

We know that the other options are incorrect because if the net force on the ball was directed upwards, the ball would be accelerating upwards.  If the net force on the ball was zero, the ball would not be accelerating at all.  If the drag was greater than the gravitational force, then the ball would be accelerating upwards as well.

Hope this helps!

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach