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## Homework Statement:

- length contraction

## Relevant Equations:

- ##L_0=\gamma L_{moving}##

While attempting this question ,

velocity of ##B## wrt ##A## ,##u'_x=\frac{u_x-v}{1-u_xv/c^2}## where ##u_x=-0.6c,v=0.8c## comes out to be ##-0.945c## (approaching)..

The distance between ##A## and ##B## seen by ##A## at ## t=0## is ##d=\sqrt(1-.8^2)4.2×10^8## comes out to be ##252*10^6m##

Therefore collision time seen in ##A's## frame is ##d/0.945c## which is 0.888(x=8.8) but the ans is given x=6??

Can anyone please help me in picking the mistake...

Thanks