gaffe, you don't get it.
It doesn't matter if it's Sagan who does the math - the math is the math. Run the numbers yourself.
Didja notice that the energy required to eject Venus from Jupiter would melt it even if was made of rock? You can't get around that. And the fact that the velocity required to escape Jupiter's gravity well is close to that required to escape the solar system entirely? Amazing how Venus knew that it needed 60 km s-1 but not 63 km s-1, eh?
Face it - Velikovsky is just plain wrong. No matter that Sagan is dead.