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t = 4 s
V = at => a = v/t = 20/4 = 5 m/s²
s = (at²) / 2 = (5 * 4²) / 2 = 5 * 16 / 2 = 40 m
v=20m/s
t=4s
Szukane:
s=?
s=v*t
s=20m\s*4s=80m