Which of the following are accurate units for torque?

Torque is a measure of the rotational force applied to an object, and it is critical in understanding how forces lead to rotation around an axis. The standard unit of torque is the Newton meter (Nm). This unit can be understood as the product of force (in Newtons) and distance (in meters) from the pivot point or axis of rotation.

When evaluating the other options, they do not stand as correct units of torque. For instance, Nm² suggests a measurement associated with area rather than a rotational force. Similarly, kgm² is typically associated with the moment of inertia, which measures an object's resistance to rotational acceleration rather than the force causing that rotation. Lastly, kgm could imply a linear force multiplied by a distance, but it does not correctly represent the nature of torque since it lacks the correct unit for force (which should be Newtons).

Therefore, while other choices might relate to physical concepts, they do not accurately define torque like the Newton meter does.