Forces acting on a particle settling in fluid are __________ forces.
(A) Gravitational & buoyant
(B) Centrifugal & drag
(C) Gravitational or centrifugal buoyant drag
(D) External, drag & viscous
(A) Gravitational & buoyant
(B) Centrifugal & drag
(C) Gravitational or centrifugal buoyant drag
(D) External, drag & viscous