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
A. `7.4xx10^(-4) rad//sec`
B. `6.7xx10^(-4) rad//sec`
C. `7.8xx10^(-4) rad//sec`
D. `8.7xx10^(-4) rad//sec`