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Q.

The escape velocity for a rat of mass 1 kg from the earth surface is 11.2  kms−1. The escape velocity for an elephant of mass 6000 kg would be

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a

11.2×102 kms−1

b

11.2  kms−1

c

11.2 ×10−2 kms−1

d

none of these

answer is B.

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Detailed Solution

Escape velocity is independent of mass of object.Ve=2GMR  ⇒Ve depends on mass of planet, radius of planet and height of object from the surface of the earth ⇒Ve does not depend on mass of object and angle of projection
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The escape velocity for a rat of mass 1 kg from the earth surface is 11.2  kms−1. The escape velocity for an elephant of mass 6000 kg would be