{"knowledge_schema": {"broad_category": "Physics \u2192 Particle Physics \u2192 Annihilation Processes", "refinement": "This problem involves the conservation of energy and momentum in particle interactions, specifically in the context of particle-antiparticle annihilation.", "specific_scope": "The focus is on calculating the velocity of the resulting particles (A) from the annihilation of a proton and an antiproton, given the mass-energy equivalence and the initial conditions of the system.", "goal": "Determine the velocity of the produced particles (A) after the annihilation process, using the principles of conservation of energy and momentum."}, "summary": "This problem is rooted in particle physics, specifically dealing with the annihilation of a proton and an antiproton to produce new particles. The task requires applying the conservation of energy and momentum principles to find the velocity of the resulting particles. Given the mass of the particles and the initial conditions, the goal is to calculate the velocity of particle A after the annihilation, which is determined to be 0.77c."}