Give -the magnitude and direction of the net force acting on a drop of rain falling down with a constant speed

Give -the magnitude and direction of the net force acting on a cork of mass 10 g floating on water,

Give -the magnitude and direction of the net force acting on a car moving with a constant velocity of 30 km/h on a rough road.

Give -the magnitude and direction of the net force acting on a kite skillfully held stationary in the sky,

Give the magnitude and direction of the net force acting on a stone of mass 0.1 kg, (a) just after it is dropped from the window of a stationary train,(b) just after it is dropped from the window of a train running at a constant velocity of 36 km/h,just after it is dropped from the window of a train accelerating with 1 ms^2,just after it is dropped from the window of a train accelerating with 1M/S2