springs A and B are identical except that A is stiffer than B i.e. the force constant is k(A) k(B) . in which spring is more work done if:
1. they stretch by same amount
2. they are stretched by same force
(2) When they are stretched by the same force.
In this case F (Force is the same)
(1) When stretched by the same amount, i.e. the extensions in both the springs is the same.