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Question: 

A spaceship in distress sends out two escape pods in opposite directions. One travels at a speed $v_1 = +0.70c$ in one direction, and the other $v_2 = -0.80c$ travels at a speed in the other direction, as observed from the spaceship. What speed does the first escape pod measure for the second escape pod?

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 

$-0.962c$

Giancoli 7th Edition, Chapter 26, Problem 51

(1:50)

Chapter 26, Problem 51 is solved.

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