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 produces an η0 particle. the rest mass of the η0 is mη=9.75×10−28kg. part aif the two protons and the η0 are all at rest after the collision, find the initial speed v of the protons. express your answer as a fraction of the speed of light to three significant figures. v = bwhat is the kinetic energy ek of each proton? express your answer in millions of electron volts to three significant figures. ek = cwhat is the rest energy er of the η0? express your answer in millions of electron volts to three significant figures. er =