This is a Physics Demonstration for Ballistic motion.

It is meant as a teaching tool only. Please use caution Do not aim the Device at people animals or windows .

Preparation and equipment:

1. A 3d printer and PLA filament
2. A Contraction Spring from a Broken umbrella with a spring 2cm Diameter 6cm long (it’s about 50N/m) usually a part of a long grownup umbrella.
3. M4 bolt 4 cm long and a nut.
4. An IKEA L wrench.
5. 2X M5 bolts (IKEA) 2 cm long.
6. A 20mm ball.
7. A fill and screwdriver.