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What is the mass of a 100 kg object while traveling 90 percent the speed of light?
Wiki User
∙ 12y ago
Mass = (Rest mass) / sqrt( 1 - v2/c2 )
V = 0.9 c
v2/c2 = 0.81
1 - v2/c2 = 0.19
sqrt( 0.19 ) = 0.4359
Mass = (rest mass) / 0.4359 = 2.294 x (rest mass)
For a rest-mass of 100 kg, that's 229.4 kg at 0.9 c .
Wiki User
∙ 12y ago
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