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t = 20s
a = Δv/t
a = 20/20
a = 1 m/s²
Vk-Vp= 90-18=72 72 *1000/3600= 20
a= 20/20=1 m/s2
90km/h-18km/h=72km/h przyrost prendkości
72km*1000:3600=20m/s
20m/s:20s=1m/s2