Which one is more elastic, steel or plastic ? Why ?

Explanation

`Y_(S) =(Fl)/(A Delta l _(S) ) and Y_(E) = (Fl )/( A Delta l _(E))`
where both having same length and deforming force F,
`therefore ( Y_(S))/( Y _(E)) =(Delta l _E)/(Delta l _(S))`
but ` Delta l _(E) gt Delta l _(S)`
` therefore (Y_(S))/(Y _(E)) gt 1`
`therefore Y_(S) gt Y_(E)` hece, steel is more elastic than plastic.