Question

in 5 seconds, a car goes from traveling at 30 m/s to 15 m/s. what is the acceleration of the car? a = ? m/s² enter the sign (+ or -) and the magnitude. remember: a = δv/t

Explanation:

Step1: Calculate the change in velocity

$\Delta v=v_f - v_i=15 - 30=- 15\ \text{m/s}$

Step2: Use the acceleration formula

$a=\frac{\Delta v}{t}=\frac{-15}{5}$

Answer:

$-3$