Question

The lagrangian is defined as:

(a) a.

Answer 1

It seems like your question is still appearing incomplete, as only "(a) a." is visible in the options. I’ll answer with the standard definition of the Lagrangian to help clarify:

In classical mechanics, the Lagrangian $L$ is defined as:

$$L=T-V$$

where:

• $T$ is the kinetic energy of the system,
• $V$ is the potential energy of the system.

This function forms the basis of Lagrangian mechanics, which uses the principle of least action to derive the equations of motion for a system.

Please let me know if there’s more to the question, or if you have specific options, and I’d be glad to assist!