Question

Problema 3.41*. Dau coroniță, e urgent.

Answer 1

$a)M=m_1+m_2=\textgreater m_2=M-m_1=40kg$

$Impulsul \ se \ conserva:$

$Mv=m_1v_1+m_2v_2$

$Mv-m_1v_1=m_2v_2$

$v_2=\frac{Mv-m_1v_1}{m_2}=150\frac{m}{s}$

$b)\Delta E_c=E_{cf}-E_{ci}$

$\Delta E_c=\frac{m_1v_1^2+m_2v_2^2-Mv^2}{2}$

$\Delta E_c=\frac{7,5*10^6+9*10^5-6,3*10^6}{2}$

$\Delta E_c=450000J+3750000J-3150000J$

$\Delta E_c=1050000J=1,05MJ$