Potential energy is defined

A stick of mass $m$ and length $l$ is pivoted at one end and is displaced through an angle $\theta .$ The increase in potential energy is

Initially mass $m$ is held such that spring is in relaxed condition. If mass $m$ is suddenly released, maximum elongation in spring will be

The variation of potential energy $U$ of a system is shown in figure. The force acting on the system is best represented by

The variation of potential energy $U$ of a body moving along $x$-axis varies with its position $\left(x\right)$ as shown in figure

The body is in equilibrium state at

A uniform chain of length $L$ and mass $M$ is lying on smooth table and one-third of its length is hanging vertically down over the edge of the table. If $g$ is the acceleration due to gravity, the work required to pull the hanging part on to the table is