Question: If a bar under longitudinal vibration is free at node 1 , the forward difference formula gives a. (U_{1}=0) b. (U_{1}=U_{2}) c. (U_{1}=U_{-1})

If a bar under longitudinal vibration is free at node 1 , the forward difference formula gives

a. \(U_{1}=0\)

b. \(U_{1}=U_{2}\)

c. \(U_{1}=U_{-1}\)

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