Q5.3 Give the magnitude and direction of the net force acting on a stone of mass 0.1 kg
(b) just after it is dropped from the window of a train running at a constant velocity of 36 km/h, Neglect air resistance throughout.
Since the train is travelling with the constant speed so the acceleration of the train is zero. Thus there is no force on stone due to train.
The net force acting on the stone will be the gravitational force which acts in a downward direction.
Gravitational force:-
or
or