Comets also are travelling waaaay faster than asteroids because they come from farther out in the solar system which gives them more potential/kinetic energy.

Comets also are travelling waaaay faster than asteroids because they come from farther out in the solar system which gives them more potential/kinetic energy. Generally speaking a comet will be going about three times as fast and carry about nine times the kinetic energy as an asteroid of the same size.