The escape speed of a body on the earth’s surface is 
A body is projected with thrice of this speed. The speed of the body when it escapes the gravitational pull of earth is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Let v be the speed of the body when it escapes the gravitational pull of the earth and u be speed
of projection of the body from the earth’s surface.
According to law of conservation of mechanical energy.
Where m and 
be masses of the body and earth respectively and 
is the radius of the earth.
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