m1=800 g=0,8 kg
m2=400 g=0,4 kg
Ec+Ep=Ec'=>m1vo²/2+m1gl=m1v1²/2=>v1=√(vo²+2gl)=√(2²+2*10*1,6)=√36= 6 m/s
m1v1=(m1+m2)vc=>vc=m1v1/(m1+m2)=0,8*6/(0,8+0,4)=4,8/0,12=4 m/s
Ec'=Ep'=>m1vc²/2=m1gl(1-cosα)=>cosα=1-vc²/2gl=1-4²/2*10*1,6=1-0,5=0,5=1/2=>α=60°
Emi/Emf=m1(vo²+2gl)/[(m1+m2)vc²=0,8(2²+2*10*1,6)/[*0,8+0,4)4²=0,8*36/19,2=1,5
