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Q.

The ratio of the radii of planets A and B is  k1 and ratio of acceleration due to gravity on them is k2. The ratio of escape velocities from them will be

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a

k1k2

b

k1k2

c

k2k1

d

k1k2

answer is B.

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Detailed Solution

v=2gR⇒vAvB=gAgB×RARB=k1×k2=k1k2

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