Assume all other forces on Dominic are balanced. Which statement describes the forces on Dominic?

 - The forces are unbalanced, so there is a net force on Dominic.
 - The forces are balanced, so there is no net force on Dominic.
To determine if there is a net force on Dominic, look at the forces:
Earth's gravity is pulling Dominic down with a force of 400 N.
The diving board is pushing Dominic up with a force of 400 N.
The forces are in opposite directions, and the forces have the same magnitude: 400 N. This means that the forces are balanced, so there is no net force on Dominic.