Observer a Measures the Velocity of a Rocket as and a Comet

Observer A measures the velocity of a rocket as and a comet as .Here and are parallel and in the direction of the observer's positive x axis.The speed of the comet as measured by an observer on the rocket is:

A) (u - v) /(1 - uv/c²)
B) (u - v) /(1 - v²/c²)
C) (u - v) /(1 - v²/c²) ^1/2
D) (u - v) /(1 + uv/c²)
E) (u + v) /(1 - uv/c²)

Correct Answer:

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