Atom A (mass ) moves to the right at toward identical atom B

PHYSICS · Single correct · CBSE · Physics · Work, Energy and Power · Work, Energy and Power

Problem

Atom A (mass mm) moves to the right at 200 m ⁣⋅ ⁣s−1200\,\text{m}\!\cdot\!\text{s}^{-1} toward identical atom B, which is at rest (\bigl(both atoms lie along the same line as a fixed, perfectly rigid wall located to the right of atom B)\bigr). The sequence is as follows: 1. Atom A collides elastically and head-on with atom B. 2. Atom B travels to the right and collides elastically with the wall, reversing its velocity without loss of speed. 3. Atom B (now moving left) collides elastically and head-on with the stationary atom A. After this entire sequence, what is the speed and direction of atom A? (a) 100 m ⁣⋅ ⁣s−1100\,\text{m}\!\cdot\!\text{s}^{-1} to the left (b) 200 m ⁣⋅ ⁣s−1200\,\text{m}\!\cdot\!\text{s}^{-1} to the left (c) 0 m ⁣⋅ ⁣s−10\,\text{m}\!\cdot\!\text{s}^{-1} (at rest) (d) 200 m ⁣⋅ ⁣s−1200\,\text{m}\!\cdot\!\text{s}^{-1} to the right

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