Compressive forces act normally on the end faces of a cylinder with initial length $L$. The forces shorten the cylinder so that its length becomes $0.6L$. Once the compressive forces are removed, the cylinder’s length increases to $0.8L$. What describes the deformation of the cylinder when its length was $0.6L$?
- Aboth elastic and plastic
- Belastic only
- Cplastic only
- Dneither elastic nor plastic