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20*20=400m/s
droga
s=at^2/2
s=20*20*20/2
s=4000m=4km
t = 20 [s]
V = ?
s = ?
V = at
[m/s] = [m/s² × s = m/s]
V = 20 × 20
V = 400 [m/s]
s = 1/2 at²
[m] = [m/s² × s² = m]
s = 1/2 20 × 20²
s = 4000 [m]