I had the same thought for acc, but the thing is was it said describing the entire thing and it's not just the earth that accelerates, moon does aswell. I think I threw marks on that Ke one, I just wrote velocities lmfao.
Was I the only one who found the Q14 multiple choice about gravitional attraction between moon and earth to have no correct answer? And for the projectile motion question part a where it said account for Ke, what did people do? Was vague and wasn't sure what it was asking.
I'm going to be honest I don't remember all the algebra, my brains a little cooked. Time just cancelled out in the end, i really don't feel like grinding that algebra again sorry dude. Hopefully the official solution was same as mine and u can just look at that. Or try diddling with wolfram...