If the earth’s velocity relative to b (stationary observer) is .77c and the meteor’s velocity relative to the stationary observer is 0
I'm just gonna stop you right there and remind you that you have yet to justify your 0 figure. Get to it.
It could be anything from zero to the limit of -c.
Justify your exclusion of every velocity that it actually could be.
EDIT: Actually, change of plan. I gave you enough chances to show that you've fixed your shit. You haven't. It's back to the shit tank with you.