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(a) The position vector of the centre of mass be <br> `r_(CM)=((m_(1)r_(1)+m_(2)r_(2)+.......m_(n)r_(n)))/((m_(1)+m_(2)......+m_(n)))` <br> Differentiate with respect to t to find `v_(CM)` <br> Differentiate again with respect to t to find `a_(CM)` <br> `ma_(CM)=F_(1)+F_(2)......... +F_(n)` where `m=m_(1)+m_(2).....+m_(n)` <br> `ma_(CM)=F_("EXT")=0` ( for isolated system ) <br> So, `a_(CM)=0` <br> So, `v_(CM)`= Constant