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Vi: 10 m/s
Vf: 0 m/s
x: 20 m
t: ? = 2 s
< t: x ÷ v >
t: 20 m ÷ 10 m/s = 2 s.
Aceleración= Vf - Vi
--------
t
0 m/s - 10 m/s = -10 m/s ÷ 2 s = -5 m/s
Desaceleración negativa: -5