Question

car braking. a car slows down from 20 m/s to 5 m/s in 4 seconds. what is the acceleration? hint: it will be negative.

Explanation:

Step1: Identify the acceleration formula

The formula for acceleration is $a=\frac{v - u}{t}$, where $v$ is final - velocity, $u$ is initial - velocity, and $t$ is time.

Step2: Determine the values of $v$, $u$, and $t$

Let the initial velocity $u = 20$ m/s, the final velocity $v = 5$ m/s, and the time $t = 4$ s.

Step3: Substitute the values into the formula

$a=\frac{5 - 20}{4}=\frac{- 15}{4}=-3.75$ m/s².

Answer:

$-3.75$ m/s²