The escape velocity for a planet is v_e . A tunnel is dug along a diameter of the planet and a small body is dropped into it at the surface. When the body reached the centre of the planet, its speed will be

Q: The escape velocity for a planet is ve . A tunnel is dug along a diameter of the planet and a small body is dropped into it at the surface. When the body reached the centre of the planet, its speed will be

(a) Zero

(b) ve/2

(c) ve/√2

(d) ve

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Ans: (c)