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

524 J 256 J 486 J 324 J

486 J

Kinetic energy : \(K = \frac{P^2}{2m}\) P = 18 kg x 6 m/s = 108 kg m/s ; m = 12 kg K = \(\frac{(18×6)^2}{2×12}\) K = 486 J