In solid mechanics, what is the correct vector form of the equations of motion for a plane elasticity problem?

In solid mechanics, what is the correct vector form of the equations

1.	In solid mechanics, what is the correct vector form of the equations of motion for a plane elasticity problem?
A.	D*σ+f=ρü
B.	D*σ+f=ρu̇
C.	D2*σ+f=ρü
D.	D*σ+f=ρu
Answer» B. D*σ+f=ρu̇

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In solid mechanics, what is the correct vector form of the equations of motion for a plane elasticity problem?

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