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?


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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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