(a) Two protons are placed at separation...

(a) Two protons are placed at separation `d` on a smooth surface. Find the speed of each proton when separation between them is doubled.
(b) An `alpha`-particle and a proton are placed at a separation `d` on a smooth surface.Find the speed of each when separation between them becomes infinite. (`m`: mass of proton , `e`: charge of proton.)

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