A man of mass \( m \) starts moving w.r.t. a platform of mass \( 2 \mathrm{~m} \) with a velocit...

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A man of mass \( m \) starts moving w.r.t. a platform of mass \( 2 \mathrm{~m} \) with a velocity \( \mu=9 / 13 \mathrm{~m} / \mathrm{s} \) as shown in the figure. The platform is fitted with a concave mirror of focal length \( f \). The velocity of image \( (\mathrm{m} \mathrm{m} / \mathrm{s}) \) at the initial moment is
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