Tunnel across the Earth

A straight tunnel is bored through the centre of the earth, A body of mass m is dropped into it. If the motion of body is simple harmonic then find its time period (in second).

Details

  1. Radius of the Earth = 6.4×106 m6.4 × 10^{6} \text{ m}
  2. g=9.8 ms2 g = 9.8 \text{ ms}^{-2} , π=3.14 \pi = 3.14
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