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Ek = 8kg x (5 m/s)² /2 = 4 x 25 = 100J
m=8kg
v=5m/s
Ek=?
Ek=mv do kwadratu/2
Ek=8x5do kwadratu/2
Ek=8x25/2
Ek=200/2
Ek=100
m=8kg
V²=5m/s=25 m/s
Ek= 8kg*25m/s/2
8kg i 2 skróci się
wynik: 100J