Is it possible for a ball to return to the same height from which it was thrown?
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No, not without the use of additional energy. You will have conversion losses: Due to the intermittent deformation when it hits the ground and impacts. You will also have friction losses, e.g. when the ball flies through the air.
A throw is not automatically the same as a free fall.
So think of the material is a basketball, for example, rather than a football. And also how strong you throw it or just let your ball go
No. That would be a perpetuum mobile. Not possible.
As a child, I threw rubber balls on the ground, which are higher than I jumped back.
Without friction.
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