A particle of mass \( \mathrm{m} \) moving with horizontal speed \( 6 \mathrm{~m} / \mathrm{sec}...

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A particle of mass \( \mathrm{m} \) moving with horizontal speed \( 6 \mathrm{~m} / \mathrm{sec} \) as shown in figure. If \( m \ll M \) then for one dimensional elastic collision, the speed of lighter particle after collision will be
[MP PMT 2003]
(m) \( \stackrel{u_{1}=6 \mathrm{~m} / \mathrm{s}}{\longrightarrow} \ldots \)
(a) \( 2 \mathrm{~m} / \mathrm{sec} \) in original direction
(b) \( 2 \mathrm{~m} / \mathrm{sec} \) opposite to the original direction
(c) \( 4 \mathrm{~m} / \mathrm{sec} \) opposite to the original direction
(d) \( 4 \mathrm{~m} / \mathrm{sec} \) in original direction
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