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Construct a perpendicular line through one side and intersecting the other. Then construct another line from that intersector and beginning at the point it intersects the second side. The two should be the same line.
Yah, I think so.
If the length of the second pendulum of the earth is about 1 meter, the length of the second pendulum should be between 0.3 and 0.5 meters.
The second.
... and what is the question? The second ball should arrive at the floor a second after the first, both should have the same speed.