Tension force is measured in Newtons (N), which is the standard unit of force in the International System of Units (SI).
To elaborate, 1 Newton is defined as the force required to accelerate a 1-kilogram mass by 1 meter per second squared. Hence, the unit for tension force can also be expressed as kg·m/s², which is equivalent to Newtons.
This means that among the options given, the correct answer is 5 kg·m/s², as it directly corresponds to the definition of force.