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A tunnel has been dug through the centre of the earth and a ball is released in it. It executes S.H.M. with time period

Options

  1. A42 minutes
  2. B1 day
  3. C1 hour
  4. D84.6 minutes

Correct answer

D. 84.6 minutes

Step-by-step solution

T =2 R g =2 64 10⁶ 9.8 =2 22 7 8 10³ 7 2 = 2 22 8 1000 49 60 =84.6 ~min

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