[填空题]
An electron starting from resx 1+woisyxiad pq .c-w)j. 3/at acquire/c1g,h 8fy xej/slov g16gu2vs 6.3 keV of KE in moving from point A to point B. veggxv ,oshu// 162cg8j fyl 1 (a) How much KE would a proton acquire, starting from rest at B and moving to point A? keV
(b) Determine the ratio of their speeds at the end of their respective trajectories.