A somewhat academic question but I suspect that the pre-conditions or essential assumptions for such a test over 300000 km are close to unachievable:
- a completely incompressible physical connection
- with absolute rigidity to avoid bending
- operating in a vacuum to avoid surface drag
- with no temperature variation to avoid expansion and contraction
- in zero gravity to avoid distortion over such a distance
- of zero mass to avoid delay in acceleration and deceleration
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