2 bodies of different masses of \( 2 \mathrm{~kg} \) and \( 4 \math...

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2 bodies of different masses of \( 2 \mathrm{~kg} \) and \( 4 \mathrm{~kg} \) are moving with velocities \( 20 \mathrm{~m} / \mathrm{s} \) and \( 10 \mathrm{~m} / \mathrm{s} \) towards each other due
\( \mathrm{P} \) to mutual gravitational attraction. What is the velocity of

W their centre of mass?
(a) \( 5 \mathrm{~m} / \mathrm{s} \)
(b) \( 6 \mathrm{~m} / \mathrm{s} \)
(c) \( 8 \mathrm{~m} / \mathrm{s} \)
(d) zero
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