Here's why:

* Escape velocity is the minimum speed an object needs to escape the gravitational pull of a planet or other celestial body.

* At escape velocity, the rocket's kinetic energy (energy of motion) is equal to its gravitational potential energy (the energy it has due to its position in Earth's gravitational field).

* This means the rocket has enough speed to overcome the pull of gravity and continue moving outward, never to return.

Important Notes:

* Reaching escape velocity doesn't mean the rocket is going to another planet. Escape velocity only ensures it won't fall back to Earth. To reach another planet, the rocket would need to be directed towards that planet and have the right speed and trajectory.

* Escape velocity is not a constant. It depends on the mass of the celestial body you are trying to escape from and the distance from its center. For Earth, escape velocity is about 11.2 km/s (about 25,000 miles per hour).

Let me know if you have any other questions!