In our usual coordinate system( +x to the right, +y up (away from the center of the Earth), +z out of the page toward you), what is the vector gravitational force on a 31 kg object sitting on the ground? (From the momentum principle you can conclude that a force of the same magnitude is exerted upward by the ground on the object if the momentum isn't changing. In Chapter 4 we'll see more about the origin of this force.)

The vector gravitational force is  

Explanation:

From the question we are told that

      The mass of the object is  

      The acceleration due to gravity experienced by the object is

Generally the vector gravitational force on the object is mathematically represented as

The  -y indicates that the direction of the force is towards the center of the earth

explanation: magnetic pole, region at each end of a magnet where the external magnetic field is strongest. the south-seeking pole, or any pole similar to it, is called a south magnetic pole. unlike poles of different magnets attract each other; like poles repel each other.

option number c is the right answer.