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v₂ = 700 m/s
s=70 cm = 0,7 m
t= ?
a= ?
s=v₁t + at²/2 ∧ a=Δv/Δt
s=v₁t + (Δv/Δt * t²)/2 = 0 * t + [(v₂-v₁)/t *t²]/2 = [v₂*t]/2
0,7 = 700t/2
0,7 = 350t
0,7/350 = t
t=0,002 s
a=(v₂-v₁)/t=700/0,002=350000 m/s²