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Q.

The escape velocity of a body from earth is 11.2 km/s. If a body is projected with a velocity twice its escape velocity, then the velocity of the body at infinity is (in km/s)

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a

19.4

b

194

c

1.94

d

0.194

answer is A.

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Detailed Solution

velocity at infinityv∞=v2−ve2=[2(11.2)]2−(11.2)2

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The escape velocity of a body from earth is 11.2 km/s. If a body is projected with a velocity twice its escape velocity, then the velocity of the body at infinity is (in km/s)