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7=2s
V1=140km/h
V2=212km/h
V2-V1-v
212-140=72
V=72km/h=72*1000/3600=20m/s
a=v/t
a=m/s/s=m/s*1/s=m/s2
a=20/2
a=10m/s2
licze na najlepszą ;)
v₂ = 212 km/h ≈ 58,9 m/s
a -to przyspieszenie
t - czas, t = 2 s
Δv = v₂ - v₁, Δv = 20 m/s
a= Δv ÷ Δt
a = 20 m/s ÷ 2 s = 10 m/s²
a= 1/2 2V1-Vo= 2 x 39m/s - 59m/s= 9,5 m/s'
140km/h= 39m/s
212km/h= 59 m/s
a' - kwadrat a :)