Spirits of salts, but don't try it at home.
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it is ms. m is milli, s is second
12.7 kg / m
(4 m/s - 54 m/s)/0.75 s = -50/0.75 m/s² = -200/3 ≈ - 66.67 m/s² (negative because he is decelerating)
-1.92 m/s2