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

2.23 m/s^2

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=(18.1)/(8.1) \\ \\ a=2.23\text{ m/s}^2 \end{gathered}`

The acceleration is equal to 2.23 m/s^2