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The escape velocity from the earth is ab...

The escape velocity from the earth is about 11 km/s. The escape velocity from a planet having twice the radius and the twice mean density as the earth, is

A

`22 km//sec`

B

`11 km//sec`

C

`5.5 km//sec`

D

`15.5 km//sec`

Text Solution

Verified by Experts

The correct Answer is:
A
`v_e=sqrt((2GM)/R)=sqrt((2G.4/3piR^3p)/R)=Rsqrt(8/3piGp)`
`V_epropRrArrv_p=2v_e=22km//sec`
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