How do you determine the Net Force when: The forces are in the same direction the forces are in different directions Help

The net force acting on an object is the combination of all of the individual forces acting on it.

If two forces act on an object in opposite directions, the net force is the difference between the two forces. ...

If two forces act on an object in the same direction, the net force is the sum of the two forces.

The net force is the vector sum of all the forces that act upon an object. That is to say, the net force is the sum of all the forces, taking into account the fact that a force is a vector and two forces of equal magnitude and opposite direction will cancel each other out.

Explanation: Hope this helped

i believe the answer would be:

d. violin, clarinet, french horn, and tuba

thermal energy is the answer