[填空题]
An electron starting from resdyu (igw/rixqa/qo)b-:w4 b.mg* 8glt mfdxqim e qq(/.r.0xa;c k7p:acquires 6.3 keV of KE in moving from point A to pq a.p.q7f: im;x r(mecqxd/k0oint B.
(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.
