>>510206810
nah because gravity will be pulling and slowing on the rock less and less the further you go out
To go from reaching the moon to reaching the sun you just need a smidgen (2%) more energy because the gravity of that remain section is very small. It's smallness is so miniscule that it won't significantly slow down your rock even over that enormous distance it'll need to travel (400x more than the distance to the moon).

(But in reality hitting the sun is far far harder because you need to also nullify the velocity the rock inherits from the earth that is travelling very quickly around the solar system. If you want to hit the moon you don't need to change this velocity as much because the moon is travelling at a similar velocity to earth.)