Materials provided to students:
Students are to determine a method of determining the elastic constant. One method of solving the problem is to use a combination of projectile motion and conservation of energy. The conservation of energy is elastic potential energy before firing is equal to kinetic energy immediately after firing. The speed in that formula can be determined if students fire the shooter horizontally from a measured height and measure the distance the disc travels.
I found these shooters several years ago from Oriental Trading Company, but you can also another type of toy shooter. I particularly like this model because of the additional tie in to circular motion but any other style will work.