Answer
0.168 MeV.
Work Step by Step
First find the factor $\gamma=\frac{1}{\sqrt{1-u^{2}/c^{2}}}=\frac{1}{\sqrt{1-1/1.52^{2}}}=1.3278$.
The relativistic kinetic energy is $(\gamma-1)mc^2=(0.3278)(0.511MeV)=0.168 MeV$.
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