how fast a rocket would have to go to leave every planet
We all know that rockets travel at very high speeds to leave the planet. Did you ever think how the speeds will have to be when it comes to the other planets? Check this amazing animation explaining the relative speeds of the rockets on different planets.
Escape Velocity: the lowest velocity that a body must have in order to escape the gravitational attraction of a particular planet or other object. It varies from planet to planet and depends on the gravitational force of the planet, its mass and radius.
Image from Tech Insider