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Vo = 100km/jam = 27,778 m/s
Vt = 0 m/s
s = 20 m
a = ?
Vt^2 = Vo^2 + 2.a.s
0^2 = 27,778^2 + 2.a.20
0 = 771,6 + 40 a
a = (0 - 771,6) / 40
a = 771,6/40
a = -19,29 m/s^2 ----------->tanda minus menujukkan perlambatan
maka besar perlambatannya adlah 19,29 m/s^2
semoga membantu 6_^