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Vt = 90 m/s
S = 12 km = 12000 m
t = ................?
*mencari percepatan
Vt² = Vo² + 2aS
90² = 30² + 2 (a) (12000)
8100 = 900 + 24000a
7200 = 24000a
a = 0,3 m/s²
*Mencari waktu
Vt = Vo + at
90 = 30 + 0,3t
60 = 0,3t
t = 60/0,3
t = 200 sekon
Jadi, waktu yang dibutuhkan adalah 200 sekon