Earth has mass 8 times and radius 2 times that of a planet. If the escape velocity from the earth is 11.2 km / s , the escape velocity in km / s from the planet will be :

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TestHub · Accepted Answer

​ V escape ​ = R 2 GM ​ ​ ( V escape ​ ) Earth ​ ( V escape ​ ) Planet ​ ​ = ( M E ​ M P ​ ​ ) × ( R P ​ R E ​ ​ ) ​ = 2 1 ​ ( V escape ​ ) Planet ​ = 2 1 ​ ( V escape ​ ) Earth ​ = 5.6 km / s ​

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