Answer
$1.0\; m/s^{2}$ left
Work Step by Step
Right is the positive direction:
$v^{2}=u^{2}+2ax$
$a=\frac{v^{2}-u^{2}}{2x}=\frac{0^{2}-5.0^{2}}{2(12.5)}=-1.0\; m/s^{2}$
Hence, acceleration is $1.0\; m/s^{2}$ left
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