A bomb of mass 30 kg at rest explodes into two pieces of masses 18 kg and 12 kg. The velocity of 18 kg mass is 6 ms^-1. The kinetic energy of the other mass is

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Correct answer: B. (b): According to law of conservation of angular momentum, 30 0=18 6+12 v ⇒108=12v ⇒v=-9m/s . Negative sign indicates that both fragments move in opposite direction. K.E. of 12 kg= 12mv^2= 12 12 81=486J

$A bomb of mass 30 kg at rest explodes into two pieces of masses 18 kg and 12 kg . The velocity of 18 kg mass is 6 m s^{- 1} . The kinetic energy of the other mass is$

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