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
c. some value more than 3c/4
b. some value less than 3c/4
d. 3c/4
C
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a. 4 b. 12 c. 1000 d. 10,000 e. 76
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Fill in the blank(s) with the appropriate word(s).
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