What kind of motion indicates a system where the net force equals zero
only accelerating objects
only stationary objects
both accelerating and stationary objects
only objects moving with a constant positive velocity
stationary objects as well as objects moving with a constant velocity

The correct answer is:

stationary objects as well as objects moving with a constant velocity

Explanation:

According to Newton's second law, when the net force on an object is zero, then it means that its acceleration is zero. In fact:

where F is the net force, m is the mass of the object, a is its acceleration. From this law we see that when F is zero, a (the acceleration) is also zero.

But acceleration=0 does not mean that the object is stationary: it means that the object is either stationary, or it is moving at constant velocity. So, the correct answer is

stationary objects as well as objects moving with a constant velocity

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