Answer
$K=226MeV$
Work Step by Step
As the mass of a muon is 207 times the mass of electron, hence
$m=207\times (0.511MeV)=106MeV$
We know that:
$K=m(\gamma-1)$
We plug in the known values to obtain:
$K=106(3.1364-1)=226MeV$
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