# Question #1180e

Dec 14, 2016

#### Answer:

Deceleration$= 8 m {s}^{-} 2$.

#### Explanation:

Using the following kinematic equation connecting quantities of interest, also assuming it is constant deceleration
$v = u + a t$
where $v \mathmr{and} u$ are final and initial velocities respectively, $a$ is acceleration and $t$ is the time.

Inserting given values we get
$0 = 80 + a \times 10$
Rearranging we get
$10 a = - 80$
Solving for $a$,
$a = - 8 m {s}^{-} 2$