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Which outcome occurs when a spacecraft's engines operate continuously, closely approaching the threshold imparted by the Equivalence Principle?

A)Constant proper acceleration and gravity
B)Constant spacetime curvature increase only
C)Inertial mass matches gravitational mass
D)Decreasing proper acceleration in vacuum

💡 Explanation

A continuous thrust simulates a gravitational field via the Equivalence Principle. Because proper acceleration remains constant relative to the spacecraft, Earthbound observers measure decreasing acceleration over time; therefore constant proper acceleration rather than fluctuating or constant curvature develops due to inertia.

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