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The graph above shows data collected with a motion sensor for the velocity of a pendulum bob as a function of time as the pendulum undergoes simple harmonic motion:
Which of the following is NOT a conclusion that can be drawn from this graph?
Over time, the maximum kinetic energy of the bob decreases.
Over time, the maximum potential energy of the bob decreases.
Over time, the mechanical energy of the pendulum-Earth system is constant.
Over time, the internal energy of the pendulum and its surroundings increases.