I have read my lecture notes like 4 times, but they are hard to understand, I was wondering if anyone could help me pleasee? ^_^

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I have read my lecture notes like 4 times, but they are hard to understand, I was wondering if anyone could help me pleasee? ^_^

Here is the question ''The K0 meson is a particle made up of a strange and a down quark. A K0 meson with unknown 3- momentum decays into two π mesons (K0 → π+π). One of the π mesons is created at rest. What is the energy of the other π meson? (Given Mπ = 137 MeV and MK = 494 MeV.) (Hint: Use 4-momentum conservation).'' K0 is K with a tiny little zero in the top right corner if it matters (don't see why it would but you never know) Help is greatly appreciated thanks :)

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I have read my lecture notes like 4 times, but they are hard to understand, I was wondering if anyone could help me pleasee? ^_^

I have read my lecture notes like 4 times, but they are hard to understand, I was wondering if anyone could help me pleasee? ^_^

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