Mathematically, the work-energy theorem is expressed as:
```
W = ΔK
```
where:
* W is the net work done on the body
* ΔK is the change in the body's kinetic energy
If W = 0, then ΔK = 0, which means that the body's kinetic energy does not change. Therefore, the body cannot accelerate.
In other words, for a body to accelerate, there must be a net force acting on it, and this force must do positive work on the body. If the net work done on the body is zero, then the body cannot accelerate.