Bob is on Earth. Anna is on a spacecraft moving away from Earth at 0.6c. At some point in Anna's outward travel, Bob fires a projectile loaded with supplies out to Anna's ship. Relative to Bob, the projectile moves at 0.8c, (a) How fast does the projectile move relative to Anna? (b) Bob also sends a light signal, "Greetings from Earth," out to Anna's ship. How fast does the light signal move relative to Anna?
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