The concept of it is to fling heavy stuff far without a lot of effort of pushing it or pulling it
There is no such concept of a negative black hole outside the fictional computer game involving Sentry Catapult.
catapult
you make a catapult!
Catapult is a noun.
where was the catapult used
A Trebuchet Catapult
A mangonel is a kind of catapult.
A mangonel is a catapult, not a bridge.
how did you incresed the accuacy of your catapult
Who invented the rocket Catapult
They used the catapult for war.
Owen designed a new catapult for the navy to use on its aircraft carriers. Lady Taylor Smith