A particle of mass $m$ is dropped from a height $R$ equal to the radius of the earth above the tunnel dug through the earth as shown in the figure. Hence the correct statement is
Diffcult
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(d)
When the particle is outside the tunnel force acting on it is $\propto \frac{1}{r^2}$ where, $r$ is the distance from the centre of the earth.
When the particle is inside the tunnel force acting on it is $\propto \frac{1}{r}$ where, $r$ is the distance from the centre of the earth.
In both cases, force is always directed towards the centre of the earth.
Thus motion is oscillatory and also periodic but not $SHM$.
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