Question

Doua corpuri se misca unul spre celalalt M1=2kg m2=1 kg v1=0.1 m/s v2 = 0.5 m/s Se cere viteza dupa ciocnirea plastica si caldura degajata

Answer 1

Vectorial: m1v1+m2v2=(m1+m2)u
Scalar: -m1v1+m2v2=(m1+m2)u=>u=(-m1v1+m2v2)/(m1+m2)=(-0,2+0,5)/(2+1)=0,3/3=0,1 m/s
Q=-ΔEc=m1v1²/2+m2v2²/2-(m1+m2)v²/2=>Q=m1m2/[2(m1+m2)](v1+v2)²=2/6*0,36=0,12 J

Sper sa fie corect!