Assuming there is not friction or air resistance, which of the following is true about total mechanical energy of a swinging pendulum? A. It remains constant throughout the entire swing

B. It is the greatest at the bottom

C. It is zero the entire time

D. It is the greatest at the top

16. in a reaction that has reached equilibrium, a. the forward and reverse reactions are occurring at the same rate. b. the reactants and products are in equal concentrations. c. the forward reaction has gone further than the reverse reaction. d. there are equal numbers of atoms on both sides of the equation. e. a, b, and d are correct.