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percepatan = (perubahan kecepatan) / selang waktu
= (0 - 72) / 10
= -7,2 m/s^2
tanda "-" menandakan perlambatan
2)
jarak = kecepatan x waktu
waktu = 15 menit = 900 detik
kecepatan = 68 km/jam = 18,88 m/s
jarak = 18,89 x 900 = 17000 meter
3)
percepatan = (perubahan kecepatan) / selang waktu
= (20 - 15) / 10
= 0,5 m/s^2