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a=2m/s2
a=v/t => t=v/a
t=20m/s / 2m/s2
t=10s
Predkosc po 8s.
v=v0-at
v=20m/s-2m/s2 * 8s
v=4m/s
Predkosc po 4s.
v=v0-at
v=20m/s - 2m/s2 * 4s
v=12m/s
s=v0t-1/2at2
s=20m/s*10s-1/2 *2m/s2*100s2
s=200m-100m
s=100m
Proszę ;)