Question

what do u mean by hydrodynamics ?

Answer 1

hydrodynamic is the a branch of physics that deals with the motion of fluids and the forces acting on solid bodies immersed in fluids and in motion relative to them — compare hydrostatics.

Answer 2

hii...
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Resistance experienced by the body when it is kept in fluid , is called the hydrodynamic , When body is kept in stationary fluid then hydrodynamic drag is the sum of all force acting on the body.

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hope this helps !