The correct answer is option 2: Increases.

When the net work done on an object is positive, it means that the total work done on the object is in the same direction as its motion. This positive net work increases the object`s kinetic energy.

Kinetic energy is the energy possessed by an object due to its motion. It is directly proportional to the mass of the object and the square of its velocity. When work is done on an object, it transfers energy to the object. In the case of positive net work, the object gains energy, which increases its kinetic energy.

Therefore, when the net work done on an object is positive, its kinetic energy increases. It is important to note that the relationship between net work and kinetic energy is dependent on the direction and magnitude of the work done. If the net work done is negative (opposite to the direction of motion), then the kinetic energy would decrease.

Alert - correct answer should be Alert - correct answer should be option 3: Remains constant.