Suppose there is a K0 meson that moves past us (to the right) with a speed of (1/2)c. In the K0 rest frame, it decays into to π2's, with one going straight up and the other going straight down with equal and opposite velocities v0. How fast do the π0's move in the laboratory in terms of v0 (at what angle w.r.t the vertical)?

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Suppose there is a K0 meson that moves past us (to the right) with a speed of (1/2)c. In the K0 rest frame, it decays into to π2's, with one going straight up and the other going straight down with equal and opposite velocities v0.

How fast do the π0's move in the laboratory in terms of v0 (at what angle w.r.t the vertical)?

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