Problem: A spacecraft passes an Earth-bound osberver at a speed of 0.5 c. If the ship then fires a missile at 0.4 c relative to the captain of the ship, what speed does the Earth-bound observer measure the missile at?

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A spacecraft passes an Earth-bound osberver at a speed of 0.5 c. If the ship then fires a missile at 0.4 c relative to the captain of the ship, what speed does the Earth-bound observer measure the missile at?