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Q.

If a hole is bored along the diameter of the earth and a stone is dropped into hole

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a

The stone reaches the centre of the earth and stops there

b

The stone reaches the other side of the earth and stops there

c

The stone executes simple harmonic motion about the centre of the earth

d

The stone reaches the other side of the earth and escapes into space

answer is C.

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Detailed Solution

The stone execute S.H.M. about centre of earth with time period  T=2πRg; where R = Radius of earth.
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If a hole is bored along the diameter of the earth and a stone is dropped into hole