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Q.

A body weighs 60 kg on the earth's surface. What would be its weight at the centre of the earth?


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a

60 kg wt

b

6 kg wt

c

60×9.8 kg wt

d

zero 

answer is D.

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Detailed Solution

The weight at the centre of the earth is zero.
Because the value of g is zero, the weight of a body at the centre of the earth is zero. The mass of the earth between the centre of the earth and the body decreases as we move closer to the centre of the earth. This reduces the force acting on the body from the centre of the earth.
W=m×g=0 
The weight of the body is the force that pulls it towards the centre of the earth.
W=m×g 
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