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Physics · WORK, ENERGY AND POWER

हिन्दी

A 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:

  1. \( +u \)
  2. \( -u \)
  3. \( 0 \)
  4. \( +2u \)

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 \( v_{1f} \approx -u \).

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