$K$ is the force constant of a spring. The work done in increasing its extension from $l_1$ to $l_2$ will be

Two springs have spring constants $k_{A}$ and $k_{B}$ such that $k_{A} > k_{B}$. If both springs are stretched by the same extension $x$,the work required will be:

What is the spring constant? On what factors does the work done by a spring depend?

As per the given figure,two blocks each of mass $250\,g$ are connected to a spring of spring constant $2\,N/m$. If both are given velocity $V$ in opposite directions,then the maximum elongation of the spring is:

The $P.E.$ of a certain spring when stretched from natural length through a distance $0.3\, m$ is $10\, J$. The amount of work in joule that must be done on this spring to stretch it through an additional distance $0.15\, m$ will be ................ $J$.

Show that the law of conservation of mechanical energy is obeyed by pulling or compressing the block tied at the end of a spring.