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125%=5/4
(5/4)m = m/√(1-(v/c)²)
√(1-(v/c)²) = 4/5
1-(v/c)² = 16/25
(v/c)² = 25/25 - 16/25
(v/c)² = 9/25
v/c = 3/5
v = 0,6 c