How Do I Solve the Momenergy Problem in Physics Homework?

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Homework Statement



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Homework Equations





The Attempt at a Solution



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I am not sure if I answer it correctly.
Can anyone help me to check?
 

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E_k = Mv^2/2 = 2*5E6*42^2/2 = 8.8E9J = mc^2

solve for little m which will be in kg so you must convert to milligrams.