Suppose a spaceship heading straight towards the Earth at 0.685c can shoot a canister at 0.475c relative to the ship. (Assume the positive direction is toward the Earth. Indicate the direction with the sign of your answer.) (a) What is the velocity of the canister relative to the Earth, if it is shot directly at the Earth? (b) What is the velocity of the canister relative to the Earth, if it is shot directly away from the

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