This graph shows how the potential energy of a reaction system changes over time. Which statement is true for this system? A. The potential energy of the products is greater than the potential energy of the reactants. B. The potential energy at point A represents the activation energy. C. The potential energy of the products is lower than the potential energy of the reactants. D. The potential energy at point C represents the activation energy.

On a horizontal frictionless surface, a small block with mass 0.200 kg has a collision with a block of mass 0.400 kg. immediately after the collision, the 0.200 kg block is moving at 12.0 m/s in the direction 30° north of east and the 0.400 kg block is moving at 11.2 m/s in the direction 53.1° south of east. use coordinates where the +x-axis is east and the +y-axis is north.(a) what is the total kinetic energy of the two blocks after the collision (in ) what is the x-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your ) what is the y-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your answer.)