That is just what worried me.It really did not make much sense.
Now could you comment the two examples I made.
Is KE = 2.25x 10 ^7 J, final v= 1.8x 10^ 4 m/s, 18 Km/ sec if electron is at rest ? and much more if it is not?
And in a cyclotron why the increase in KE is the same at every passage even if speed is always different?
(P.S. should we say derived or derivative quantity?)