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a = 6 m/s^2
s = 12 m
Szukane
t = ?
s=(a * t^2)/2
2s = a * t ^2
t^2 = 2s / a
t = sqrt (2s/a)
t = sqrt (24/6)
t = sqrt (4)
t = 2 s
Ciało potrzebuje 2 sekundy, by pokonać drogę 12 m przy przyśpieszeniu 6 m/s^2
s=0,5 a t*2
t*2=2s/ a
t*2=4s*2
t=2s
Odp: 2s .