Answer
$a = -2.8~m/s^2$
Work Step by Step
$a = \frac{v^2-v_0^2}{2x}$
$a = \frac{(6.0~m/s)^2-(8.0~m/s)^2}{(2)(5.0~m)}$
$a = -2.8~m/s^2$
Magnitude = $ 2.8~m/s^2$
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