# 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 = $$6.4 × 10^{6} \text{ m}$$
2. $$g = 9.8 \text{ ms}^{-2}$$ , $$\pi = 3.14$$
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