Final answer:
The recessional velocity of a galaxy 108 light-years away from us is calculated using Hubble's Law and is 2376 meters per second when using a Hubble constant of 22 km/s per million light-years.
Step-by-step explanation:
To calculate the recessional velocity of a galaxy using Hubble's Law, you'll need to know the distance to the galaxy and the Hubble constant.
Hubble's Law is generally expressed as
v = H × d,
where v is the recessional velocity, H is the Hubble constant, and d is the distance in light-years.
If we have a Hubble constant of 22 kilometers per second per million light-years, then a galaxy that is 108 light-years away would have a recessional velocity of 2.376 kilometers per second.
To obtain the speed in meters per second, we convert kilometers to meters, which results in a speed of 2376 meters per second.