Raindrops of radius 1 mm and mass 4 mg are falling with a speed of 30 m/s on the head of a bald person. The drops splash on the head and come to rest. Assuming equivalently that the drops cover a distance equal to their radii on the head, estimate the force exerted by each drop on the head.
Given: initial velocity 
Final velocity 
Mass of the droplet= 
Radius of the droplet =
Distance covered by the drop on the head, 
Using the equation of motion 
Thus, acceleration 
Thus, the force 
1