A particle is kept at rest at a distance R (earth's radius) above the earth's surface.
A particle is kept at rest at a distance R (earth's radius) above the earth's surface. The minimum speed with which it should be projected so that it does not return is
(a) √(GM/4R)
(b) √(GM/2R)
(C) √(GM/R)
(d) √(2GM/R)
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(c) √(GM/R).
EXPLANATION:
The particle at rest is at 2R away from the earth's center.
So, Escape velocity u = √(2GM/2R) = √(GM/R)
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