Question

question 1-2 if a runners speed changes from 8 m/s to 4 m/s in 2 seconds, what is their acceleration? 8 m/s² 4 m/s² -2 m/s² 2 m/s²

Explanation:

Step1: Define variables

$u=8\ \text{m/s}, v=4\ \text{m/s}, t=2\ \text{s}$

Step2: Use acceleration formula

$a=\frac{v-u}{t}=\frac{4-8}{2}=-2\ \text{m/s}^2$

Answer:

-2 m/s²