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ΔEp=mgΔh
1400 J=m*10m/s²*2m
1400 J=m*20m²/s²
m=1400/20 kg
m=70 kg
m = Ep:gh
m = 1400J:(10m/s^*2m)
m = 1400L:20m^/s^
m = 70kg
Ep1=m x 10 x 0 = 0
Ep2=Ep1+1400
Ep2=1400
Ep2= m x 10 x 2
m = 70 [kg]
chłopiec waży 70kg