1.

The escape velocity of a body on an imaginary planet which is thrice the radius of the earth and double the mass of the earth is (v_(e ) is the escape velocity of earth) :

Answer»

`sqrt(2//3) v_(E )`
`sqrt(3//2)v_(e )`
`sqrt(2)//3v_(e )`
`2//sqrt(3)v_(e )`

Solution :Escape velocity `v_(e)^(.)=sqrt((2GM.)/(R.))=sqrt((2Gxx2M)/(3R))`
`v_(e )^(.)= sqrt((2)/(3)).v_(e )`.
THUS correct choice is (a).


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