Galaxy b moves away from galaxy a at 0.511 times the speed of light. galaxy c moves away from galaxy b in the same direction at 0.743 times the speed of light. how fast does galaxy c recede from galaxy a. express your answer as a fraction of the speed of light.

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

The speed at which galaxy C recedes from galaxy A is 0.90891c

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.