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m = 2 kg
t = 5 s
F = 10 N
szukane:
Ek = ?
Ek = mv^2/2
a = F/m = 10N/2kg = 5 N/kg = 5 m/s2
v = a * t = 5m/s2 * 5s = 25 m/s
Ek = 2kg * (25m/s)^2/2
Ek = 625 J