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V=20m/s
Ek=mv2/2
Ek= 2*400*1/2
Ek=400J=O,4kJ
Ek = 2 x 20² / 2 [kg x m/s=J]
Ek=2 x 400/2
Ek=400 J
m=2kg Ek=?
v=20m/s
rozwiazanie
Ek=mv kwadrat / 2
Ek=2 * 20 do kwaadratu/ 2
Ek=2*400/2
Ek=400J