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Escape velocity of a body from earth is ...

Escape velocity of a body from earth is "11.2km/s" .If the radius of a planet be one- third the radius of earth and mass be one-sixth that of earth,the escape velocity from the planet is:

A

"4.2km/s"

B

"8.4km/s"

C

"7.9km/s"

D

"11.2km/s"

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