Three objects \( A, B \) and \( C \) are kept in a straight line on a frictionless horizontal su...

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Three objects \( A, B \) and \( C \) are kept in a straight line on a frictionless horizontal surface. These have masses \( m, 2 m \)
P and \( m \), respectively. The object \( A \) moves towards \( B \) with a

W speed \( 9 \mathrm{~ms}^{-1} \) and makes an elastic collision with it. Thereafter, \( B \) makes completely inelastic collision with \( C \). All motions occur on the same straight line. Find the final speed (in \( \mathrm{ms}^{-1} \) ) of the object \( C \).
(2009)
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