What is the source of KE of falling rain drops ?

Rain drops are felling with velocity (2hat i- 3 hatj) m/s. What should be the velocity of man so rain drops hit him with speed 5 m/s.

A man walking with a speed of 3 km/h finds the rain drops falling vertically downwards. When the man increases his speed to 6km/h he find that the rain drops are falling making an angle of 30^(@) with the vertical . Find the speed of the rain drops ( in km/h)

The KE of a freely falling body

Water drops are falling from a tap in regular interval of time. A drop falls from the tap and after 4secs of falling the drop is 34.3m away from next drop. Then drops are falling at rate of ( g= 9.8 m/s^2 )

A rain drop of radius 0.4 mm falls through air with a terminal velocity of 50 cm s^(-1) . The viscosity of air is 0.019 Pa-s . Find the viscous force on the rain drop.

Why are falling liquid drops spherical?