What is the physical meaning of Virtual displacement?

Virtual displacement is a concept created to explain the virtual work, which in turn gives the criteria for a system to be at equilibrium. This methodology is adopted to find the trajectory of a contraintless system,by method of Lagrangian dynamics.

 

Virtual displacement is a displacement by the particle,without involving time. Which is generally considered as the mathematical concept we place for the 'change In configuration' of the system. But how do a system change its configuration in no time?

 

 

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