Which article of the Indian Constitution abolishes untouchability?

If the kinetic energy of a particle of mass $m,$ performing uniform circular motion in a circle of radius $r,$ is $E,$ find the acceleration of the particle.

Two particles $\mathrm{A},\mathrm{ }\mathrm{B}$ are moving on two concentric circles of radii $R_1$ and $R_2$ with equal angular speed $\omega .$ At $t=0,$ their positions and direction of motion are shown in the figure:

The relative velocity $\overrightarrow{V_A}-\overrightarrow{V_B}$ at $t=\frac{\pi }{2\omega }$ is given by:

A rubber band stretches and reverts to its original position. Bubble gum stretches, but it would not return to its original position.

Is there any difference between the two processes? Discuss it with respect to plant growth. [Hint: Elasticity (reversible) Plasticity (irreversible)]