If a Galaxy Had No Dark Matter,how Would the Velocity $\propto$

question 19

Multiple Choice

If a galaxy had no dark matter,how would the velocity (v) of a star that orbited far outside the visible extent of the galaxy depend on its distance (r) from the center of the galaxy?

• A) v \(\propto\) r^-1/2
• B) v \(\propto\) r²
• C) v \(\propto\) r^-1
• D) v \(\propto\) r