Total volume of rain drops, received 100 cm in a year by area 1m2 =1m2×
100
100
m=1m3 As we know, density of water, d=103kg∕m3 Therefore, mass of this volumeof water M=d×v=103×1=103kg Average terminal velocity of rain drop v=9m∕s (given) Therefore, energy transferred by rain, E=