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Q.

The escape velocity from the surface of the earth of radius R and density ρ is

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a

2πGρR2

b

2R2πρG3

c

2πRg

d

22πρG3

answer is A.

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Detailed Solution

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ve=2GMR, M=43πR3ρ

⇒ve=2GR×43πR3ρ=2R2πρG3

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