If you proceed with the calculation by setting the energy 8.83X10-13 J equal to the KE = (1/2)mv2 you will get an absurd answer!
v = 14X108 m/s = 4.6c!
The reason is that the problem must be solved relativistically. All that can be said qualitatively is that the velocity is near (but less than) the speed of light.

If you would like to see the solution to this problem using special relativity click here.

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