4) Spacecraft A has a speed of 0.9 c with respect to the earth if spacecraft B travels at a speed of 0.3 c with respect to A. What is the speed of B with respect to the earth? a. 0.86 C b. 0.6 C c. 0.2 C d. nothing is right
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4) Spacecraft A has a speed of 0.9 c with respect to the earth if spacecraft B travels at a speed of 0.3 c with respect to A. What is the speed of B with respect to the earth?
a. 0.86 C
b. 0.6 C
c. 0.2 C
d. nothing is right
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