Suppose you do an experiment to determine the force acting on a body. You find that the force is always directed exactly opposite to the displacement of the body from the origin of the coordinates, and always increases in magnitude by a factor of 4 when the distance from the origin is increased by a factor of 2. Which of these equations describes this force? (b is a positive constant)
Answers
answer 1 
answer 2 
answer 3 
answer 4 
none of the above