Kinetic Energy of Classical Particle

Definition
Let $\mathcal M$ be an $n$-dimensional Euclidean manifold.

Let $P$ be a particle with an inertial mass $m_i$.

Let $t$ be the time variable of $P$.

Suppose the position of $P$ is a real differentiable $n$-dimensional vector-valued mapping $\mathbf x = \map {\mathbf x} t$.

Then the kinetic energy of a classical particle $P$ is:


 * $T = m_i \paren {\dfrac {d \mathbf x} {d t} }^2$

where $\paren {\dfrac {d \mathbf x} {d t} }^2$ is the dot product of the vector $\dfrac {d \mathbf x} {d t}$ with itself.