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Vt (kecepatan akhir) = 60 km/jam
t = 15 menit = 0,25 jam
s = ?
Vt = Vo + (a.t)
60 = 72 + (a.0,25)
60 = 72 + 0,25a
-12 = 0,25a
a = -12 : 0,25
a = -48 (bertanda minus berarti mengalami perlambatan)
Vt^2 = Vo^2 + 2as
60^2 = 72^2 + 2.-48.s
3600 = 5184 - 96s
96s = 1584
s = 1584 : 96 = 16,5 km
Semoga bermanfaat :)