Question

Urgent ! raspunsurile at trebui sa for 1,8 m/s si 0,162 J​

Answer 1

$x=6 cm=0,06 m\\m=100 g=0,1 kg\\v=0\\\Delta E_c=L\\L=L_G+L_N+L_{F_el}\\L_G=0\\L_N=0\\L_{F_el}=-\frac{kx^2}{2}\\\Delta E_c=E_c-E_{c_o}=\frac{mv^2}{2}-\frac{mv_o^2}{2}=0- \frac{mv_o^2}{2}=-\frac{mv_o^2}{2}\\\Delta E_c=L<=>-\frac{kx^2}{2}=-\frac{mv_o^2}{2}|*(-2)=>v_o^2=\frac{kx^2}{m}=\frac{90*0,06^2}{0,1}=900* 0,0036=3,24=>v_o=\sqrt{3,24}=1,8=>v_o=1,8 m/s$

$L_{F_el}=|\Delta E_c|=\frac{mv_o^2}{2}=\frac{0,1*1,8^2}{2}= 0,05*3,24=0,162J=>L_{F_el}=0,162J$