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# A famous relation in physics relates 'moving mass' m to 'rest mass' $m_0$ of a particle in terms of its speed v and the speed of light c. (This relation first arose as a consequence of special theory of relativity due to Albert Einstein). A boy recalls the relationship almost correctly but forgets where to put the constant c. Guess where to put the missing c.

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## 1 Answer

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$m = m_0 \bigg( 1- \large\frac{v^2}{c^2} \bigg)^{-\large\frac{1}{2}}$
Hence (B) is the correct answer.
answered Jun 3, 2014