What is the weight of a block of mass $5 k g$ at the centre of the Earth? $(g = 9.8 m s^{- 2}$ )

50 N

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100 N

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Z e r o

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150 N

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Solution

The correct option is C $Z e r o$
Weight of an object is the force acting on it due to gravity of the Earth.
$W = m g$
But, $g$ (i.e. acceleration due to gravity) is zero at the centre of the Earth. Therefore the weight of the block would be zero at the centre of Earth.

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