Answer
1.667 m/$s^{2}$
Work Step by Step
We use the formula $v_{f}=v_{o}+at$.
Using the values from answer (a) and the given values,
$15=5+a(6)$
Now, solving for $a$:
$15=5+a(6)$
$15-5=6a$
$10=6a$
$1.667=a$
$a=1.667$
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