Suppose a spaceship heading straight towards the Earth at 0.750c can shoot a canister at 0.500c relative

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Suppose a spaceship heading straight towards the Earth at 0.750c can shoot a canister at 0.500c relative to the ship.

(a) What is the velocity of the canister relative to the Earth, if it is shot directly at the Earth? 

(b) If it is shot directly away from the Earth?

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