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m = 100 kg
t = 2 s
v1 = 36 km/h = 10 m/s
v2 = 108 km/h = 30 m/s
szukane:
a) F = ?
b) s = ?
a)
F = m * a
ale a = dv/t = (30m/s - 10m/s)/2s = 10 m/s2
F = 100kg * 10m/s2
F = 1000 N = 1 kN
b)
s = vot + at^2/2
s = 10m/s * 2s + 10m/s2 * (2s)^2/2 = 20m + 20m
s = 40 m