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A stone is dropped freely into a tunnel along the diameter of the earth. When it reaches the center of earth then it has only

a) Potential energy b) Kinetic energy c) weight d) none of there

1 Answer

As it reaches center of earth $g=0$ and it has zero potential energy.
So it does not have weight
It has aquired the kinetic energy due to the loss of potential weight
Hence b is the correct answer
answered Aug 23, 2013 by meena.p
edited Jul 2, 2014 by lmohan717

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