Two bodies of masses \( 2 \mathrm{~kg} \) and \( 4 \mathrm{~kg} \) are moving with velocities \(....

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Two bodies of masses \( 2 \mathrm{~kg} \) and \( 4 \mathrm{~kg} \) are moving with
\( \mathrm{P} \)
velocities \( 20 \mathrm{~ms}^{-1} \) and \( 10 \mathrm{~ms}^{-1} \) towards each other
W
due to mutual gravitation attraction. What is the velocity of their centre of mass?
(1) \( 5 \mathrm{~ms}^{-1} \)
(2) \( 6 \mathrm{~ms}^{-1} \)
(3) \( 8 \mathrm{~ms}^{-1} \)
(4) Zero


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