An-earth-based-observer-sees-rocket-A-moving-at-0-70c-directly-towards-rocket-B-which-is-moving-towards-A-at-0-80c-How-fast-does-rocket-A-sees-rocket-B-approaching-

Question Number 59780 by necx1 last updated on 14/May/19

A n e a r t h - b a s e d o b s e r v e r s e e s r o c k e t A

m o v i n g a t 0.70 c d i r e c t l y t o w a r d s r o c k e t

B, w h i c h i s m o v i n g t o w a r d s A a t 0.80 c .

H o w f a s t d o e s r o c k e t A s e e s r o c k e t B

a p p r o a c h i n g ?

Answered by ajfour last updated on 14/May/19

v_{rel} = \frac{0 . 7 c + 0 . 8 c}{1 + 0.56} \approx 0 . 9615 c

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