Mass of moon is 1//81time that of earth ...

Mass of moon is `1//81`time that of earth and its radius is `1//4` the earth's radius. If escape velocity at surface of earth is `11.2 km/s`, then its value at surface of moon is

`0.14km//s`

`2.5km//s`

`0.5km//s`

`5km//s`

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