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One could simply drop a length of tubing down the hole until it touches the top of the ball and create a vaccuum by sucking on the tube while you bring the tubing back up. Or one could use a suction tip from a toy arrow on a long dowel to attach to the ball. Or use compressed air to blow under the ball,or drop rubber cement down the hole and then a weighted string to stick to the ball. Or...................many way I suppose.

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You cannot suck the ball out, the pipe is finite according to the question, thus a vaccuum lock would be created if you did so. You cannot presume to have the strength to turn the entire concrete base upside down, according to the picture the concrete base is the ground itself. However filling the pipe with water (again, it has a 30cm finite area) would cause the ball to float to the top, allowing the person to simply remove it by hand once it has reached the surface.

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The puzzle states that the pipe is closed on one end and stuck in pavement, so presumably those responses that speak of opening the pipe underneath, seem to miss the point.

Ping-pong balls float and the pipe width is slightly greater than the ball. So, pouring water in the pipe will cause it to fill up around the ball and will bring it to the top with no damage done.

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