A spaceship is moving relative to a stationary target with a velocity of $v_{ST} = +0.78c$. It fires a photon torpedo with a velocity relative to the spaceship of $v_{SP} = +0.66c$. What is the velocity $v_{PT}$ the torpedo relative to the target?
Added by Robert H.
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Step 1: The velocity of the torpedo relative to the target is the sum of the velocity of the spaceship relative to the target and the velocity of the torpedo relative to the spaceship. Show more…
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