Gravitation Question 170

Question:If the radius and acceleration due to gravity both are doubled, escape velocity of earth will become [RPMT 2002]

Options:

A)11.2 km/s

B) 22.4 km/s

C) 5.6 km/s

D) 44.8 km/s

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Answer:

Correct Answer: B

Solution:

$ [v=\sqrt{2gR}] $ .

If g and R both are doubled then v will becomes two times i.e. 11.2 × 2 = 22.4 km/s



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