1.

Two relativistic particles move at right angles to each other in a laboratory frame of reference, one with the velocity v_1 and the other with the velocity v_2. Find their relative velocity.

Answer»

Solution :The approach VELOCITY is defined by
`vecV_(approach)=(dvecr_1)/(dt)-(dvecr_2)/(dt)=V_1-vecV_2`
in the laboratory FRAME. So `V_(approach)=sqrt(v_1^2+v_2^2)`
On the other hand, the RELATIVE velocity can be obtained by USING the velocity addition formula and has the componets
`[-v_1, v_2sqrt(1-(v_1^2/c^2))]` so `V_r=sqrt(v_1^2+v_2^2-(v_1v_2^2)/(c^2))`


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