A weight of mass m is at rest at O when suspended from a spring, as shown. When it is pulled down and released, it oscillates between positions A and B. Which statement about the system consisting of the spring and the mass is correct?
A. The gravitational potential energy of the system is greatest at A.
B. The elastic potential energy of the system is greatest at O.
C. The rate of change of momentum has its greatest magnitude at A and B.
D. The rate of change of gravitational potential energy is smallest at O.
E. The rate of change of gravitational potential energy has its greatest magnitude at A and B.
Answer: C
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