fizyka energia praca moc kartkówka

Em=Ek+Ep Em=ghm+mv^2/2=10*1*3+1*2^2/2=30+2=32J  b 13 w=F*s = 4*5=20J 14 Ep=mgh m=Ep/gh=1000/(10*20)=1000/200=5kg c 15 W=ΔEk Ek=mv^2/2 v=[latex] sqrt{2Ek/m} [/latex]=[latex] sqrt{2*4/2} [/latex]=[latex] sqrt{4} [/latex]=2m/s b 16 F=Fc F=mg=50*10=500N=0,5kN a