Problem

An object moves with constant acceleration

\mathbf{a}

. Which of the following expressions are also constant ? a.

\frac{d|\mathbf{v}|}{dt}

\left| \frac{d\mathbf{v}}{dt} \right|

\frac{d(v^2)}{dt}

\frac{d\left(\frac{\mathbf{v}}{|\mathbf{v}|}\right)}{dt}