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M = M0 / sqrt( 1 - v2/c2 )

If M = 2M0 then

sqrt( 1 - v2/c2 ) = 0.5

( 1 - v2/c2 ) = 0.25

1 - 0.25 = 0.75 = v2/c2

v2 = 0.75 c2

v = sqrt(0.75) c = 0.866 c = 259,627,885 meters (161,325 miles) per second

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