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A particle of mass \( m \) moving with horizontal speed \( 6 \mathrm{~m} / \mathrm{sec} \) as shown in figure. If \( \mathrm{m}\mathrm{M} \) then
P for one dimensional elastic collision, the speed of

W lighter particle after collision will be
(1) \( 2 \mathrm{~m} / \mathrm{sec} \) in original direction
(2) \( 2 \mathrm{~m} / \mathrm{sec} \) opposite to the original direction
(3) \( 4 \mathrm{~m} / \mathrm{sec} \) opposite to the original direction
(4) \( 4 \mathrm{~m} / \mathrm{sec} \) in original direction
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