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v = 5
Ek1 = mx5^2/2 = 25m/2 = 12,5 m
Ek2 = m x 10^2/2 = 100m/2 = 50m
Ek2/Ek1 = 50/12,5 = 4
Ek wzrosla 4x
4.
A) o 300J
b) Energie kinetyczna
c)Kula moze wykonac prace w wys. 300J