Initial speed of rain drop = 30 m/s They cover distance equal to their radii which is 1 mm So, using v2=u2 + 2as, find a which is the deceleration Force exerted by the head on the drop to stop the drop = mass of drop x a By newtons third law, force exerted by drop is opposite to this force but magnitude is same.
So, 4 mg x Deceleration (a) will give you the answer. Do the necessary unit conversions.
thank you very much rohil, i got the answer. the full question is: raindrops of radius 1mm and mass 4mg are falling with a speed of 30m/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.
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