Answer:
0.90891c
Explanation:
u = Speed of Galaxy B relative to Galaxy A = 0.511c
v = Speed of Galaxy C relative to Galaxy B = 0.743c
c = Speed of light
Relativistic equation for velocity is given by
[tex]w=\frac{u+v}{1+\dfrac{uv}{c^2}}\\\Rightarrow w=\dfrac{0.511+0.743}{1+\dfrac{0.511c\times 0.743c}{c^2}}\\\Rightarrow w=0.90891c[/tex]
The speed at which galaxy C recedes from galaxy A is 0.90891c
