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a = F/m = ΔV/t
2N/0,5kg = ΔV/5s
4m/s² = ΔV/5s |*5s
20m/s = ΔV
ΔV = 20m/s
zadanie 2
S = at²/2
S = (10m/s²*4s*4s)/2
S = 160m/2
S = 80m
zadanie 3
S = at²/2 |*2
2S = at² |:a
2S:a = t²
t = √(2S:a)
t = √(2*80m:10m/s²)
t = √(160m:10m/s²)
t = √16s²
t = 4s
V = a*t
V = 10m/s²*4s
V = 40m/s