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F = 500 N
v1 = 5 m/s
v2 = 10 m/s
t = 1 s
szukane:
m = ?
F = m * a /:a
m = F/a
ale
a = dv/t = (v2 - v1)/t = (10m/s - 5m/s)/1s = 5 m/s2 = 5 N/kg
m = 500N/5N/kg
m = 100 kg