Answer :

Mass of planet M = 8 x mass of earth = 8 x 6 x 1024 kg


Radius of planet R = 2 x radius of earth = 2 x 6.4 x 106 m


G = gravitational constant = 6.67 x 10-11 N m2/kg2


So escape velocity = √


Escape velocity =


= 22.4 km/sec.


So escape velocity of the planet will be 22.4 km/sec


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