1.

A bomb of mass 30 kg at rest explodes in to two pieces of masses 18 kg and 12 kg. The velocity of 18 kg mass is 6ms^(-1). The kinetic energy of the outer mass is

Answer»

324 J
486 J
256 J
5245 J

Solution :By conservation of momentum
`30xx0=18xx6+12+VtoV=-9ms^(-1)`
`K.E.=1/2 MV^(2)=486J`


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