Q.

If g is the acceleration due to gravity at the earth's surface and r is the radius of the earth, the escape velocity for the body to escape out of earth's gravitational field is

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a

gr

b

2gr

c

g/r

d

r/g

answer is B.

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Detailed Solution

Escape velocity Ve=2gr
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If g is the acceleration due to gravity at the earth's surface and r is the radius of the earth, the escape velocity for the body to escape out of earth's gravitational field is