Q.

If the radius and acceleration due to gravity both are doubled, escape velocity of earth will become

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a

11.2 km/s

b

22.4 km/s

c

5.6 km/s

d

44.8 km/s

answer is B.

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Detailed Solution

v=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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If the radius and acceleration due to gravity both are doubled, escape velocity of earth will become