Your part "a" isn't correct it says you need to find the acceleration not velocity, the velocity you find also incorrect.a)Compute hte radial accleration of a point at the equator of the earth. b)repeat for the north pole of hte earth. Take the radius of the eartk to be 6370 km.
so for a) i got 9.9337 m/s square which is right
but for b) the answer is just zero