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Surface Tension — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsSurface Tension1 Mark
MCQ
Two masses $m_A$ and $m_B$ moving with velocities $v_A$ and $v_B$ in opposite directions collide elastically. After that the masses $m_A$ and $m_B$ move with velocity $v_B$ and $v_A$ respectively. The ratio $\left(m_A / m_B\right)$ is
  • ✓
    1
  • B
    $\frac{v_A-v_B}{v_A+v_B}$
  • C
    $\left(m_A+m_B\right) / m_A$
  • D
    $v_A / v_B$
✓

Answer

Correct option: A.
1
(a) Since bodies exchange their velocities, hence their masses are equal so that $\frac{m_A}{m_B}=1$

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