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What would be the angular speed of earth...

What would be the angular speed of earth, so that bodies lying on equator may experience weightlessness ?
( g = `10m//s^(2)` and radius of earth = 6400 km)

A

`1/800 rad//s`

B

`1/400 rad//s`

C

`1/600 rad//s`

D

`1/100 rad//s`

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The correct Answer is:
A
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