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h1-120cm=1,2m h2-150cm=1,5m
m=600g=0,6kg
g-10m/s2
Ep1=1,2m*0,6kg*10m/s2
Ep1=7,2J
Ep2=1,5m*0,6kg*10m/s2
Ep2=9J
ΔE=9J-7,2J=1,8J