The work-energy theorem states that the net work done on a body is equal to it's change in kinetic energy: $W_\text{net}=\Delta K=K_\text{final}-K_\text{initial}$. This means it only deals with two instants in time: whatever you label as "initial" and whatever you label as "final". It tells you nothing about what happens at times between these two instants. To determine "the rest" you would need to determine the dynamics using Newton's second law.

The work-energy theorem states that the net work done on a body is equal to it's change in kinetic energy: $W_\text{net}=\Delta K=K_\text{final}-K_\text{initial}$. This means it only deals with two instants in time: whatever you label as "initial" and whatever you label as "final". It tells you nothing about what happens at times between these two instants; the dynamics are lost, and the equation doesn't explicitly concern itself with the time over which the work is done. To determine "the rest" you would need to determine the dynamics using Newton's second law.