Physics

Problem

Which of the following gives the correct mathematical expression for average velocity

v_{\text{avg}}

of a particle moving from position

x_i

x_f

in time

\Delta t

? a)

v_{\text{avg}}=\dfrac{|\Delta x|}{\Delta t}

v_{\text{avg}}=\dfrac{x_f+x_i}{2\,\Delta t}

v_{\text{avg}}=\dfrac{\Delta x}{\Delta t}

v_{\text{avg}}=\dfrac{\text{distance travelled}}{\Delta t}