The correct answer is B. Non zero.

Explanation:

• According to Newton's Second Law of Motion, $F = ma$, where:
  • $F$ is the net force,
  • $m$ is the mass of the object,
  • $a$ is the acceleration.

If the object is accelerating at $7.8 \, \text{m/s}^2$, there must be a net force acting on it. The exact value of the net force depends on the mass of the object, which isn't provided in the problem. However, since there is acceleration, the net force is non-zero.

Would you like further details or have any other questions?

Here are 5 related questions:

1. What is Newton's Second Law of Motion, and how is it applied?
2. How can you calculate net force if the mass of an object is known?
3. If acceleration is zero, what does that imply about the net force?
4. How does mass affect the net force required to achieve a certain acceleration?
5. What are the SI units for force, mass, and acceleration?

Tip: To find net force, always consider both the mass and the acceleration of the object.