Any constraint to pull anything down?

Hi, I am new to this type of stuff(Physics and constraints) I am currently working on a small little project, I built a cantaloupe, 2 actually. Each of them will have a different system on how they will fly the boulder. I am working on 1 as of now, this one has a big part attached to it. Once it falls, it forces the the part the launches the boulder up. The big part needs some speed though so that is why it’s in the air. Also any other tips would be helpful!

Here is a video(My pc is bad sorry for the bad quality)


or
https://gyazo.com/bbf532e633947ac85a2e00dfb39ff83f
(Edit, i would recommend the second link)

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