Question: A rod flies with constant velocity past a mark which is stationary in the reference frame K. In the frame K it takes t =

A rod flies with constant velocity past a mark which is stationary in the reference frame K. In the frame K it takes Δt = 20 ns for the rod to fly past the mark. In the reference frame fixed to the rod the mark moves past the rod for Δt' = 25 ns. Find the proper length of the rod.

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