Creating a Particle. Two protons (each with rest mass M = 1.67 × 10−27kg) are initially moving with equal speeds in opposite directions. The protons continue to exist after a collision that also produces an η0 particle (see Chapter 44). The rest mass of the η0 is m = 9.75 × 10−28 kg. (a) If the two protons and the 17° are all at rest after the collision, find the initial speed of the protons, expressed as a fraction of the
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