Relative speed between two objects

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SUMMARY

The discussion centers on calculating the relative speed between two jets of material ejected from a radio galaxy, both moving at 0.750c. The formula used for this calculation is u'x = ux - v / (1 - ux(v)/c²). The initial attempt by the user, Kevin, correctly identifies the need to apply the formula but requires clarification on the use of absolute values to determine relative speed rather than velocity. The solution involves careful application of relativistic velocity addition principles.

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Homework Statement


Two jets of material from the center of a radio galaxy are ejected in opposite
directions. Both jets move at .750c relative to the galaxy. Determine the speed
of one jet relative to the other.


Homework Equations


u'x = ux-v/1-ux(v)/c^2


The Attempt at a Solution


u' = -.750c - .750c/1-(-.750c)(-.750)/c^2

Is this the right start?
Thanks,
Kevin
 
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Yes, although you might want to take the absolute value in the end to get a relative *speed*, rather than velocity.

I'm assuming here you meant to put some brackets in the right places.
 

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