laucnching entity by a weight seesaw

i am trying to make an unofficial addon for sonicraft which adds in some missing things that i would see as canon such as missing zones missing games ect.

so i am trying to make what is seen in the image here https://imgur.com/a/nzsZb91 which is suppose to launch you after the weight lands back down on the side of it and the way of launching the weight is to jump onto it any ideas on how?