Question

if the upthrust is considered as action, what is the reaction this reaction is exreted on what and by what

Answer 1

The reaction of the upthrust is known as buoyancy force .
It acts on the object as an downward force . This reaction force can also be considered as weight of the body .

Answer 2

Answer:upthrush force experience by a body immersed partially or full is called buoyant force and the reaction is know as W < FB the body of floats

Explanation: