To determine the velocity of a satellite in orbit at a new radius, we can use the formula for the orbital velocity of a satellite, which is given by:
\[ v = \sqrt{\frac{GM}{r}} \]
where \( G \) is the gravitational constant, \( M \) is the mass of the Earth, and \( r \) is the orbital radius.
If the original orbital radius is \( r \) and the corresponding velocity is \( v \), then at a new orbital radius of \( 5r \), the velocity \( v' \) would be:
\[ v' = \sqrt{\frac{GM}{5r}} \]
This can be expressed in terms of the original velocity \( v \):
\[ v' = \sqrt{\frac{1}{5}} \cdot \sqrt{\frac{GM}{r}} \] \[ v' = \sqrt{\frac{1}{5}} \cdot v \]
Thus, the new velocity \( v' \) becomes:
\[ v' = \frac{v}{\sqrt{5}} \]
This corresponds to the option:
the fraction with numerator 1 and denominator square root of 5 v.
So the correct answer is: the fraction with numerator 1 and denominator square root of 5 v.