Why is a spring made of steel, not of copper?

A spring is made of steel and not of copper because

Why springs are made up of steels and not copper commonly ?

In figure the upper wire is made of steel and the lower of copper. The wires have equal cross section. Find the ratio of the longitudinals strains developed in the two wires.

Assertion : identical springs of steel and copper are equally stretched. More work will be done on the steel spring. Reason : Steel is more elastic than copper.

Something made of steel cannot float on water.

Assertion : Identical springs of steel and copper are equally stretched. More work will be done on the steel spring. Reason : Steel is more elastic than copper

Identical spring of steel and copper are equally stretched. On which, more work will have to be done ?

Two wire of same radius and lengh the are subjected to the same load. One wire is of steel and the other is of copper. If the Young's modulus of steel is twice that of copper, the ratio the energy stored per unit volume in steel to that of copper wire is