What is the main reason rockets launching eastward from coastal sites often land downrange over the Atlantic Ocean?

Answer

They are heading eastward to gain the rotational boost provided by the Earth’s spin

Launching eastward maximizes the benefit derived from the Earth's rotation. To achieve this trajectory, the first stage separates hundreds of miles out over the ocean, necessitating a landing downrange over the water.

What is the main reason rockets launching eastward from coastal sites often land downrange over the Atlantic Ocean?

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Why SpaceX Really Lands In The Ocean (Physics) - YouTube

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