# The escape speed on earth is 11.2Km/sec.It's value for a planet having double the radius and 8 times the mass of the earth is what

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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

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