According to Einstein's equivalence principle, which of the following cannot be distinguished from a system accelerating with uniform acceleration in the presence of no gravity by any measurement within the system?
A)
a system moving with constant velocity in the presence of no gravitational force
B)
a system that only contains massless objects
C)
a system that is not accelerating, but is subject to a uniform gravitational acceleration
D)
a system that is moving at the speed of light
E)
a system in free fall
C
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