Shitty Ask Science

It's surprisingly tricky. You're going to need the mass, cross-sectional area, and the Reynolds number of it's form, then you need to consider launch angle, relese velocity, and how it deforms under acceleration and the air resistance, it's angle and speed of rotation, and probably many other characteristics. After that the calculations are non-trivial.

Alternatively just yeet a (model of a) sea anemone and measure the reulting velocity. If any asks what you are doing, yell "SCIENCE!!" and stare at them until they back off. A Nobel prize is almost assured.