Units and measurements

A famous relation in physics relates ‘moving mass’ m to the ‘rest mass’ mo
of a
particle in terms of its speed v and the speed of light, c. (This relation first arose as
a consequence of special relativity due to Albert Einstein). A boy recalls the relation
almost correctly but forgets where to put the constant c. He writes :
( )
m
m
1 v
0
=
−
2
1/2
.
Guess where to put the missing c.