Two particles of mass ' \( m \) ' and \( 3 \mathrm{~m} \) are initi...

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Two particles of mass ' \( m \) ' and \( 3 \mathrm{~m} \) are initially at rest an infinite distance apart. Both the particles start moving
\( \mathrm{P} \) due to gravitational attraction. At any instant their

W relative velocity of approach is \( \sqrt{\frac{\eta G m}{d}} \), where ' \( d \) ' is their separation at that instant. Find \( \eta \).
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