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To determine the velocity \( v' \) of a satellite moved from an orbital radius \( r \) to an orbital radius of \( 5r \), 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 and \( M \) is the mass of the Earth.
For the new orbital radius \( 5r \):
\[
v' = \sqrt{\frac{GM}{5r}} = \sqrt{\frac{1}{5}} \sqrt{\frac{GM}{r}} = \frac{1}{\sqrt{5}} v
\]
Thus, the velocity of the satellite at the orbit of radius \( 5r \) is:
\[
v' = \frac{1}{\sqrt{5}} v
\]
So, the correct response is:
**1/5√v**