Certain neutron stars are believed to be rotating at about $1 \, rev/sec$. If such a star has a radius of $20 \, km$,the acceleration of an object on the equator of the star will be:
- A$20 \times 10^8 \, m/sec^2$
- B$8 \times 10^5 \, m/sec^2$
- C$120 \times 10^5 \, m/sec^2$
- D$4 \times 10^8 \, m/sec^2$
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