Question: Two spaceships are approaching each other. (a) If the speed of each is 0.6c relative to the earth, what is the speed of one relative

Two spaceships are approaching each other.

(a) If the speed of each is 0.6c relative to the earth, what is the speed of one relative to the other?

(b) If the speed of each relative to the earth is 30,000 m/s (about 100 times the speed of sound), what is the speed of one relative to the other?

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