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# A boy recalls the relation for relativistic mass (m) in terms of rest mass (m_(0)) velocity of particle V, but forgets to put the constant c (velocity of light). He writes m=(m_(0))/((1-v^(2))^(1//2)) correct the equation by putting the missing ‘c’.

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Since quantities of similar nature can only be added or subtracted, v^(2) cannot be subtracted from 1 but v^(2)//c^(2) can be subtracted from 1. <br> therefore m=(m_(@))/(sqrt(1-v^(2)//c^(2)))