Question

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

• 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 1

The correct option is C

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

The stone execute S.H.M. about centre of earth with time period

$T=2\pi \sqrt{\frac{R}{g}}$ where R = Radius of earth.