Give the magnitude and direction of the net force acting on:
1. a drop of rain falling down with a constant speed.
2. a cork of mass 10 g floating on water.
3. a kite skilfully held stationary in the sky.
4. a car moving with a constant velocity of 30 kmh
on a rough road.
5. a high speed electron in space far from all gravitating objects, and free of electric and magnetic fields.