What is equilibrium

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if a body ,under the  action of  a number of forces ,is at rest or moving with uniform velocity ,it is said to be in equilibrium.or simply if a body is moving with uniform velocity it is said to be in equilibrium.

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.