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2010-01-30T17:04:09+01:00
Dane:
F = 100 N
mr = 20 kg
v = 36 km/h = 36 1000/3600 m/s = 10 m/s
t = 10 s

szukane:
mk = ?

F = m*a = (mr + mk)*a = (mr + mk)*(vk - vp)/t = (mr + mk)*v/t
F*t = (mr + mk)*v
F*t = mr*v + mk*v
mk = (F*t - mr*v)/v

mk = (100 N * 10 s - 20 kg * 10 m/s)/ 10 m/s = (1000 kg * m/s - 200 kg * m/s)/ 10 m/s = 800 kg / 10 = 80 kg

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