7.An armada of spaceships (at rest in frame A), of proper length L, =1.10ly (ly is a unitof distance equal to the distance that light travels in a year), is moving in the +x direction at aspeed v = 0.600 c as measured in the Earth frame. A small messenger spaceship B (at rest inframe B) is sent from the tip of the armada toward the tail of the armada. It's moving in theopposite direction relative to the armada (-x direction) with u =-0.750c as measured in theframe of the armada, A. Spaceship B flies by the entire armada from tip to tail.a. What is the speed of spaceship B relative to the Earth frame, u,?b. In frame A, how long does it take for spaceship B to move from the tip of the armada to thetail of the armada?In frame B, how long does it take for spaceship B to move from the tip of the armada to theС.tail of the armada?In the Earth frame, how long does it take for spaceship B to move from the tip of the armadato the tail of the armada?In the Earth frame, how far does spaceship B travel moving from the tip of the armada to thed.е.tail?

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