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An alpha particle (the nucleus of a helium atom, with charge +2e and a mass four times that of a proton) and an antiproton (which has the same mass as a proton but charge -e) are released from rest a great distance apart. They are oppositely charged, so each accelerates toward the other.What is the speed of the alpha particle when the particles are 1.1nm apart? What is the speed of the antiproton when the particles are 1.1nm apart?

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