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m=12kg h=?
W=0,3kJ=300J E=m×g×h
g=10N/kg E=W
W=m×g×h/:m×g
h=W÷m×g
h=300÷12×10=30:12=2,5m
[J:kg×N/kg=N×m:kg×N/kg=N×m:N=m]