Answer
0.659 c
Work Step by Step
Use equation 26–5b.
$$KE=(\gamma-1)mc^2=0.33mc^2$$
$$\frac{1}{\sqrt{1-v^2/c^2}}-1=0.33$$
$$v=c\sqrt{1-\frac{1}{(1.33^2)}}=0.659c$$
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