Question

the hubble constant is about 70 km/s/mpc, which means that a galaxy traveling at 2800 km/s away from the milky way is about 40 mpc away. what would the velocity of the milky way be as seen from such a galaxy? 40 km/s 2800 km/s 700 km/s 70 km/s 1400 km/s

Explanation:

Step1: Consider relative velocity concept

According to the principle of relative motion, the velocity of one object with respect to another is equal in magnitude but opposite in direction. If a galaxy is moving away from the Milky - Way at a speed of 2800 km/s, then the Milky - Way as seen from that galaxy will be moving away from it at the same speed.

Answer:

2800 km/s