JEE Main 2025 — 29 January, Evening Shift — Question 27

Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R)

Assertion (A): Three identical spheres of same mass undergo one dimensional motion as shown in figure with initial velocities $\mathrm{v}_{\mathrm{A}}=5 \mathrm{~m} / \mathrm{s}, \mathrm{v}_{\mathrm{B}}=2 \mathrm{~m} / \mathrm{s}, \mathrm{v}_{\mathrm{C}}=4 \mathrm{~m} / \mathrm{s}$ If we wait sufficiently long for elastic collision to happen, then $\mathrm{v}_{\mathrm{A}}=4 \mathrm{~m} / \mathrm{s}, \mathrm{v}_{\mathrm{B}}=2 \mathrm{~m} / \mathrm{s}, \mathrm{v}_{\mathrm{C}}=5 \mathrm{~m} / \mathrm{s}$ will be the final velocities.

Reason (R): In an elastic collision between identical masses, two objects exchange their velocities.

In the light of the above statements, choose the correct answer from the options given below