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a = 2 m/s^2
v = 90 km/h = 90 *1000m/3600s = 25 m/s
szukane:
t = ?
s = ?
s = ?
v = a * t /:a
t = v/a = 25m/s/2m/s^2
t = 12,5 s
s = at^2/2 = 2m/s^2 * (12,5s)^2/2
s = 156,25 m