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Which one of the following statement does not hold good when two balls of masses ${m_1}$ and ${m_2}$ undergo elastic collision
When ${m_1} < < {m_2}$ and ${m_2}$ at rest, there will be maximum transfer of momentum
When ${m_1} > > {m_2}$ and ${m_2}$ at rest, after collision the ball of mass ${m_2}$ moves with four times the velocity of ${m_1}$
When collision is oblique and ${m_2}$ at rest with ${m_1} = {m_2}$, after collision the balls move in opposite directions
$(b)$ or $(c)$ both
Solution
(d) When ${m_1} > {m_2}$ and ${m_2}$ at rest, after collision the ball of mass ${m_2}$ moves with double the velocity of ${u_1}$. So option $(b)$ is incorrect.
When collision is oblique and ${m_2}$ at rest with ${m_1} = {m_2}$, after collision the ball moves in perpendicular direction. So option $(d)$ is also incorrect.
