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s = 150 m
Vt = 72 km/jam = = 20m/s
dit : t = ....?
jwb:
Vt² = Vo² + 2.a.s
20² = 10² +2.a.150
400 = 100 + 300a
300a = 400 - 100
300a = 300
a = 1 m/s²
Vt = Vo + a.t
20 = 10 + 1.t
20 = 10 + t
t = 20 - 10
t = 10s
check ulang hitungannya ya, semoga membantu:)