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0,6t
1,2 = 0,6 * v² / 2
2,4 = 0,6 * v²
2,4 / 0,6 = v²
v²=0,4
v=0,2
m = o,6t = 600 kg
Ek = 1,2 kJ = 1200 J
Szukane:
v = ?
Ek = ½m*v² |:½m
v²= 1200 J : ½*600kg
v² = 1200 J : 300kg
v² = 4 m/s
v² = √4m/s = 2m/s