An isolated particle of mass \( m \) is moving in a horizontal plane \( (X-Y) \) along the \( X ...

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An isolated particle of mass \( m \) is moving in a horizontal plane \( (X-Y) \) along the \( X \)-axis at a certain height above the ground. It suddenly explodes into two fragments of masses \( \mathrm{m} / 4 \) and \( 3 \mathrm{~m} / 4 \). An instant later, the smaller fragment is at \( y=15 \mathrm{~cm} \). The larger fragment at this instant is at
[IIT 1997 Cancelled]
(a) \( y=-5 \mathrm{~cm} \)
(b) \( y=+20 \mathrm{~cm} \)
(c) \( y=+5 \mathrm{~cm} \)
(d) \( y=-20 \mathrm{~cm} \)
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