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What should be the velocity of earth due...

What should be the velocity of earth due to rotation about its own axis so that the weight at equator becomes `2/5` of initial value? Radius of earth on equator is 6400 km and is `10 m/s^2`.

A

`7.4 xx 10^-4 (rad)/s`

B

`6.7 xx 10^-4 (rad)/s`

C

`9.7 xx 10^-4 (rad)/s`

D

`8.7 xx 10^-4 (rad)/s`

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