Launching Boxes

[Zetre]

I was first reluctant to post this, but one of the ideas i have had for a robot is one that launches boxes back to my teams scoring zone. At first, many team members liked the idea, now, they are not liking it as much. They fear a few things.
1. That it may violate the rule stating that any danger of harming the environment, other robots, or the boxes may get you disqualified
2. They feal that it would be hard to be able to launch the boxes as far as needed to do this.
I personally think that this strategy of "launching" boxes is the best strategy possible, and that the rules don't prohibit it, but they feal differently
So, i have 2 questions
1. Would launching boxes in such a way violate any rules
2. How heavy are the boxes?
Please help