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V=10 m/s
Ek=(m*V²)/2
2Ek=m*V²
m=2Ek/V²
m=500/10²
m=500/100
m=5kg
Ek=0,5kJ=500J
m=?
m=2Ek^2/V^2 (ten znaczek ^2 oznacza do kwadratu)
m=2*500^2/10^2
m=500000/100
m=5000kg
Masa wynosi 5000kg.