Two particles \( A \) and \( B \) initially at rest move towards each other under a mutual force....

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Two particles \( A \) and \( B \) initially at rest move towards
\( \mathrm{P} \)
each other under a mutual force of attraction. At the instant when the speed of \( A \) is \( V \) and the speed of \( B \) is \( 2 V \), the speed of the centre of mass is
(1) zero
(2) \( \mathrm{V} \)
(3) \( 1.5 \mathrm{~V} \)
(4) \( 3 V \)


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