Which of the following describes a net force? It is the total of the combined forces acting on an object.
It is the same thing as gravity.
It is a force that is part of the Internet.
It is the same thing as inertia.

Net force is the vector sum of forces acting on a particle or body. ... Its associated torque, the net force, becomes the resultant force and has the same effect on the rotational motion of the object as all actual forces taken together.

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.