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 become 3/5 of initial value. Radius of earth on equator is 6400 km

`8.7 xx 10^(-7)`rad/s

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

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

`7.4 xx 10^(-3)` rad / s

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