How Long To Fall Through The Earth?

Force of gravity is proportional to acceleration, if the earth has uniform density and is spherical, you can treat the total mass as a point in the center; that point mass is the origin where the force originates from so as you pass the center of the earth the force (and thus acceleration) reverses.

The force of gravity in this case is a restoring force as gravity will always act to pull you towards the origin. If you want a visual aid, look up the graph of a damped sinusoidal function.

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