Spring Projectile Launcher Help

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A device is needed to launch a small bouncy ball 1-4 meters using a spring that is initially compressed. The challenge lies in finding a method to stretch the spring effectively for the launch. Suggestions include considering a slingshot mechanism, which utilizes two springs that are compressed and then stretched. Clarification is sought on whether the spring type is predetermined or selectable. Input from the community is requested for viable construction ideas.
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I need to build a device that launches a small bouncy ball anywhere from 1-4m using a spring. The spring is initially compressed as much as it can be, so this device would need to work by stretching the spring somehow. I have tried to think of a few ways to do this, but have not come up with any good ideas. Do you guys have any idea how to build one? Thanks in advance for any help.
 
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Hint - look at a slingshot: two springs, initially compressed, get stretched and released.
What are your constraints - have you been given the spring or do you get to pick one?
 

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