The escape velocity for a planet is v_e . A particle starts form rest at a large distance form the planet, reaches the planet only under gravitational attraction, and passes through a smooth tunnel through its centre. Its speed at the centre of the planet will be:

Q: The escape velocity for a planet is ve . A particle starts form rest at a large distance form the planet, reaches the planet only under gravitational attraction, and passes through a smooth tunnel through its centre. Its speed at the centre of the planet will be:

(a) ve

(b) 2 ve

(c) 1.5 ve

(d) $\sqrt{1.5} v_e$

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Ans: (d)