The escape velocity for a planet is \( \mathrm{v}_{\mathrm{e}} \). A particle starts from rest a...

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The escape velocity for a planet is \( \mathrm{v}_{\mathrm{e}} \). A particle starts from rest at a large distance from the planet,
P reaches the planet only under gravitational

W. attraction, and passes through a smooth tunnel through its centre. Its speed at the centre of the planet will be :-
(1) \( \sqrt{1.5} \mathrm{v}_{\mathrm{e}} \)
(2) \( \frac{\mathrm{v}_{\mathrm{e}}}{\sqrt{2}} \)
(3) \( \mathrm{v}_{\mathrm{e}} \)
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