A rain drop of radius r is falling through air startin from rest the work done by all the forceson the drop when it attains terminal velocity is proportional to

A rain drop of radius r is falling through air startin from rest the w

1.	A rain drop of radius r is falling through air startin from rest the work done by all the forceson the drop when it attains terminal velocity is proportional to
Answer» `r^5` `r^7` `r^2` `r^4` ANSWER :B