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Escape velocity = √(2GM/R)
escape velocity is proportional to √(M/R)

If radius is double and mass is 8 times,
√8M/2R = √4M/R = 2√M/R
So escape velocity of planet is 2 times the escape velocity of earth

V = 2*11.2 = 22.4 km/s
2 5 2