Here's a picture I took of my brother throwing a spear, or garden stick thing. This type of action is an example of Newton's law that for every force there is an equal and opposite force. For one, he is exerting a force on the spear but the spear is also exerting a force on him as well. He is pushing the spear forward and the spear is pushing back on him. This action is almost an explosion as well. The only thing that is needed is a recoil from the spear, since he is throwing it forward but there's no significant recoil back as there would be with a gun.
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