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In 3D truss element, the nodal displacement vector in global co-ordinates is _____

a) q= [q1,q2]
b) q= [q1,q2,q3]
c) q= [q1,q2,q3,q4,q5,q6]
d) Undefined

Answer: c
Explanation: Nodes will have nodal displacements or degrees of freedom which may include translations, rotations, and for special applications, higher order derivatives of displacements.

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