1.

A 12 kg bomb at rest explodes into two piece of 4 kg and 8kg . If the momentum of 4kg piece is 20Ns, the kinetic energy of the 8kg piece I

Answer»

`25J`
`20J`
`50J`
`40J`

Solution :Law of conservation of moment
`8xxv=20`
`V=(20)/(8)=2.5ms^(-1)`
K.E. of 8 kg piccc,
`K=(1)/(2)mv^(2)=(1)/(2)xx8xx(2.5)^(2)=25J`


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