As a result of a conservative force acting parallel to the y-axis on an object, it moves along the same axis. Its energy versus the y-axis graph is given in the figure below. In the graph, it can be seen that the total energy E > U(y), which implies the speed of the object is always non-zero. Find the y values at which the force magnitude is a minimum.

• A. y = 0 m only
• B. y = 3 m, 6 m, 9 m, 14 m
• C. y = 14 m only
• D. y = 0 m, 14 m

Answer: (B)