Compressive forces are applied normally to the end faces of a cylinder of initial length $L$. The cylinder is compressed by the forces so that its length decreases to $0.6L$. After the compressive forces are removed, the cylinder’s length increases to $0.8L$.
What describes the deformation of the cylinder when its length was $0.6L$?
both elastic and plastic
2 )
elastic only
3 )
plastic only
4 )
neither elastic nor plastic
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