A rectangular board, having a length twice its width when measured at rest, is on board...
A rectangular board, having a length twice its width when measured at rest, is on board a spaceship that is flying with a relativistic speed. If an observer on Earth sees that the board is a square, how fast is the spaceship flying?
a) 0.500c
b) 0.866c
c) 0.978c
d) 0.750c
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