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v = 18 km/ h = 18000/3600 m/s = 5 m/s
s = 10 m
m = 1,2 t = 1200 kg
t = ? [s]
F = ? [N]
s = 0,5at²
a = v/t
s = 0,5(v/t)*t²
s = 0,5v*t / *2
2s = vt /:v
t = 2s/v
[t] = [m:m/s = m * s/m = s]
t = 2*10/5 s
t = 4 s
F = am
a = v/t
a = 5/4 m/s²
a = 1,25 m/²
F = 1,25*1200 [m/s²* kg = N]
F = 1500 N
Odp: Czas hamowania wynosił 4 s, a siła hamujaca 1500 N.