A spaceship traveling at 0.9c (90% the speed of light) is equipped with a 10-meter long rod that extends in the direction of motion. According to an observer on the spaceship, how long is the rod? And according to an observer who is stationary relative to the spaceship, how long is the rod?

Assume the length contraction formula is L' = L / ?, where L' is the length measured by the observer on the spaceship, L is the rest length of the rod (10 meters), and ? is the Lorentz factor given by L' = 1 / sqrt(1 - v^2/c^2), where v is the velocity of the spaceship and c is the speed of light.

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