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The escape velocity from the Earth's surface is υ. The escape velocity from the surface of another planet having a radius, four times that of Earth and same mass density is:

(1) 4 υ

(2) υ

(3) 2 υ

(4) 3 υ
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ve= v

v⁄ v=√(2gr2grp)

          =√(r⁄ 4re)

v= 2v

 

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