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Principle of virtual work why you say workdone on the system .why i am say that workdone by the system is zero.if workdone on the system is zero if it is rigid body.for rigid body there is no displacement
pagal
Principle of virtual work why you say workdone on the system .why i am say that workdone by the system is zero.if workdone on the system is zero if it is rigid body.for rigid body there is no displacement
pagal