Question

what is best to say about a runner who is running at a constant velocity? a. their acceleration is positive. b. their acceleration is negative. c. their acceleration is zero. d. their acceleration cannot be determined. please select the best answer from the choices provided.

Explanation:

Step1: Recall acceleration formula

Acceleration $a=\frac{\Delta v}{\Delta t}$, where $\Delta v = v_f - v_i$ (final - initial velocity).

Step2: Analyze constant - velocity case

If velocity is constant, $v_f=v_i$, so $\Delta v = 0$. Then $a=\frac{0}{\Delta t}=0$.

Answer:

C. Their acceleration is zero.