A Particle Is Moving the +X Direction at Speed C/2

question 7

Multiple Choice

A particle is moving the +x direction at speed c/2.Another particle is moving in the -x direction at speed c/2 toward the first particle.Which of the following best describes the speed of one particle as seen by an observer moving with the other particle?

• A)c
• B)some value less than 3c/4
• C)some value more than 3c/4
• D)3c/4

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