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120g = 0,12 kg
Ek = 0,12 kg * 120 m/s /2 = 7,2 J
Ek.=1/2*0,12kg*(120m/s)2
Ek.=86,4J
m=120g=0,12kg
Ep.=mgh.
m=0,12kg=120g
g=10m/s2