Electron A is moving west with speed 3/5c relative to the lab. Electron B is also moving

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Electron A is moving west with speed 3/5c relative to the lab. Electron B is also moving west with speed 4/5 c relative to the lab. What is the speed of electron B in a frame of reference in which electron A is at rest?
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Physics

ISBN: 978-0077339685

2nd edition

Authors: Alan Giambattista, Betty Richardson, Robert Richardson

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