# A ball rolling down a hill at 4.0 m/s accelerates at 2.0 m/s2. What is its velocity 5.0s later?

Jan 22, 2017

$14.0 {\text{ ms}}^{-} 1$

#### Explanation:

We need to use the kinematic equation involving quantities of interest: initial velocity $u$, final velocity $v$, acceleration $a$ and time $t$

$v = u + a t$

Inserting given quantities
$v = 4.0 + 2.0 \times 5.0$
$\implies v = 14.0 {\text{ ms}}^{-} 1$