Question

A car, initially at rest, accelerates for 8.1 s and has a final speed of 18.1 m/s. What was its acceleration in this time?

Answer 1

ANSWER:

2.23 m/s^2

STEP-BY-STEP EXPLANATION:

Given:

Time (t) = 8.1 sec

Initial speed (u) = 0 m/s

Final speed (v) = 18.1 m/s

Let us use the following kinematic equation:

$v=u+at$

We substitute and solve for a, like this:

$\begin{gathered} 18.1=0+a\cdot8.1 \\ \\ a=\frac{18.1}{8.1} \\ \\ a=2.23\text{ m/s}^2 \end{gathered}$

The acceleration is equal to 2.23 m/s^2