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A ladder 5.0 m long leans against a wall inside a spaceship. From the point of view of a person on the ship,
the base of the ladder is 3.0 m from the wall, and the top of the ladder is 4.0 m above the floor. The spaceship
moves past the Earth with a speed of 0.90c in a direction parallel to the floor of the ship. Find the angle the
ladder makes with the floor as seen by an observer on Earth.

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