A neutron having a mass of 1.67 xx 10^(-...

A neutron having a mass of `1.67 xx 10^(-27) kg` and moving at `10^(8) m//s`collides with a deuteron at rest and sticks to it. If the mass of the deuteron is `3.33 xx 10^(-27) kg` then the speed of the combination is

`2 xx 10^(6) ms^(-1)`

`4 xx 10^(6)ms^(-1)`

`6 xx 10^(6)ms^(-1)`

`8 xx 10^(6)ms^(-1)`

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