A bomb of mass \( 30 \mathrm{~kg} \) at rest explodes into two pieces of masses \( 18 \mathrm{~k....

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A bomb of mass \( 30 \mathrm{~kg} \) at rest explodes into two pieces
\( \mathrm{P} \)
of masses \( 18 \mathrm{~kg} \) and \( 12 \mathrm{~kg} \). The velocity of \( 18 \mathrm{~kg} \) mass is \( 6 \mathrm{~ms}^{-1} \). The kinetic energy of the other mass is
(1) \( 256 \mathrm{~J} \)
(2) \( 486 \mathrm{~J} \)
(3) \( 524 \mathrm{~J} \)
(4) \( 324 \mathrm{~J} \)


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