Answer
5 m/s
Work Step by Step
We will use the equation $x=v_{avg} \times t$ where $v_{avg}$ = $\frac{v_{o}+v_{f}}{2}$ to find $v_{o}$.
First, we plug in the values for the variables in the formula:
$60=\frac{v_{o}+15}{2}$(6)
Next, we use algebra to solve for $v_{o}$:
10= $\frac{v_{o}+15}{2}$
20=$v_{o}$+15
5=$v_{o}$
$v_{o}=5$
