[math] \ begin {align *} v_f ^ 2 & = v_i ^ 2 + 2as \\ \ left (\ frac {1} {4} \ right) ^ 2 & = 1 ^ 2 – 2a \ cdot 15 \ tag1 \ \ 0 ^ 2 & = \ left (\ frac {1} {4} \ right) ^ 2 – 2as \ tag2 \\ a & \ approx -0.03 \ text {cm / s} ^ 2 \\ s & = 1 \ texto {cm} \ end {align *} [/ math]
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