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The escape velocity for a planet is upsi...

The escape velocity for a planet is `upsilon_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 reaches the centre of the planet , its speed will be

A

`upsilon_e`

B

`upsilon_e/sqrt2`

C

`upsilon_e/2`

D

zero

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The correct Answer is:
B
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