A famous relation in Physics relates moving mass m to the rest mass `m_0` of a particle in terms of its speed `upsilon` and the sped of light c. (This relaiton first arose as a consequence of special theory of relativity due to Albert Einstein). A boy recalls the relation almost correctly but forgets where to put the constant c. He writes `m = (m_0)/((1 - upsilon^2)^(1//2)`Guess where to put the missing c?

Explanation

To solve the problem, we need to correctly identify where to place the speed of light constant \( c \) in the equation that relates the moving mass \( m \) to the rest mass \( m_0 \) of a particle. The boy wrote:

\[ m = \frac{m_0}{(1 - \upsilon^2)^{1/2}} \]

### Step 1: Understand the original relation
The correct relation from the theory of relativity is:
...