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At what height from the surface of earth the weight of the body is 1/3rd of its weight at the surface? 

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At what height from the surface of earth the weight of the body is 1/3rd of its weight at the surface? 

(a) 5000 km 

(b) 5562.5 km 

(c) 4684.8 km 

(d) 3600 km

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(c) 4684.8 km 

We know 

So, q

For weight to be 1/3rd of the weight on the earth surface gh should be 1/3rd of g. So from eq.

h = 0.732 x Re (Re = 6400km)

h = 0.732 x 6400 Km

h = 4684.8 km

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