You are presented with the quiz "What happens to the mass of an object when exerted by the object?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "the mass of an object causes the gravitational force exerted by that object" and "all gravitational forces are attractive, there is no repulsive gravitational force". 

So, what's the best answer to the question?


 

      is attractive not repulsive     