The work done by the spring force when we stretch a spring is:

A force on an object is said to do work if the force applied causes the object to move.

The force's work is equal to the product of force and displacement in the force's direction.

Work is defined as a scalar quantity.

Joule is its SI unit (J).

We know that when we stretch a spring, the elastic force causes the spring to try to return to its original position.

The spring force is always attempting to return the spring to its original position.

If we stretch a spring, the spring force acts in the opposite direction of the displacement.

As a result, the angle formed by the force and displacement in this case is: ${180}^o$.

$\theta =180$, So work done is given as,

$\overrightarrow{o}·\theta$

$W=·\cos$

$W=-W$

When we stretch a spring, the work done by the spring force is negative