calculate terminal settling velocity in water at a temperature of 20
0C of spherical silicon particles
with specific gravity 1.90 and average diameter of (a) 0.05 mm and (b) 1.0 mm

How should i study korean, and how many hours should i study it? i am a high school student already learn japanese in class, also i play sports so i tend to not study korean much because i have an excuse, like, ‘i dont know how to properly study for korean’ 감사합니다