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vo = 0
t = 15 s
v = 15 m/s
F = 1400 N
szukane:
m = ?
F = m * a /:a
m = F/a
ale a = dv/t = 15m/s/15s = 1 m/s2 = 1 N/kg
m = 1400N * 1N/kg
m = 1400 kg = 1,4 t
Vk=15m/s
t=15s
a=Δv/t
a=(Vk-Vp)/t
a=15m/s/15s=1m/s^2
a=F/m
m=F/a
m=1400N/1m/s^2
m=1400kg