A starship moves away from Mars at a speed of 0.75c relative to Mars. The starship launched a small rocket with the length of 13 m as measured by an observer on the starship. The small rocket moves in the same direction as the starship at a speed of 0.40c relative to the starship. i) Find the velocity of the small rocket relative to Mars. ii) Calculate the length of the small rocket as measured by an observer on Mars.

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