The rest energy of the electron is
Eo= moc2
We calculate energy
In this case we must include the relativistic correction
E= m c2/ sqrt ( 1- (u/c)2)
They tell us that energy is 17% = 0.17 greater than the rest energy
E = Eo + 0.17 Eo = 1.17 Eo
moc2/ sqrt ( 1- (u/c)2) = 1.17 moc2
1/sqrt ( 1- (u/c)2) = 1.17
1 = 1.172( 1- (u/c)2)
1/1.172 = 1 – (u/c)2
(u/c)2= 1 – 0.7305 = 0,2695
u = c sqrt (0.2695)
u = 0.519 c
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