# A car starting from rest accelerates at a rate of 8.0 m/s. What is its final speed at the end at 4.0 seconds?

Dec 2, 2015

$v = 32 \frac{m}{s}$.

#### Explanation:

I will assume that you mean that the acceleration is $8.0$ $\frac{m}{s} ^ 2$, as $8.0 \frac{m}{s}$ is a value for velocity, not acceleration.
Here, we use the formula $v = u + a t$, where $v$ is the final velocity, $u$ is the initial velocity, $a$ is the acceleration, and $t$ is time. Let's substitute values, then:
$v = u + a t$,
$v = 0 + 8.0 \cdot 4.0$
$v = 32$,
$v = 32 \frac{m}{s}$.

Hope it Helps! :D .