Give the magnitude and direction of the net force acting on
(a) a drop of rain falling down with a constant speed.
(b) a cork of mass 10g floating on water
(c) a kite skillfully held stationary in the sky
(d) a car moving with a constant velocity of 30km h-1 on a rough road
(e) a high – speed electron in space far from all material objects, and free of electric and magnetic fields.