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Physics · WORK, ENERGY AND POWER
हिन्दीA light particle of mass \( m_1 \) moving with speed \( u \) collides elastically in one dimension with a very massive body of mass \( m_2 \) (\( m_2 \gg m_1 \)) initially at rest. The velocity of the lighter particle after collision is approximately:
Correct answer · Option 2
\( -u \)
Explanation
From \( v_{1f} = \frac{m_1 - m_2}{m_1 + m_2} u \), when \( m_2 \gg m_1 \), \( \frac{m_1 - m_2}{m_1 + m_2} \approx -1 \), so \( v_{1f} \approx -u \).
