Question

Va rogg e urgent nu știu cum sa fac

Answer 1

m=200g=0,2 kg

h=10m

Δ$E_C=L_T$

$E_{C_F}-E_{C_I}=L_T\\E_{C_B}-E_{C_A}=L_T$

$\frac{mv_B^2}{2} -\frac{mv_A^2}{2}=mgh$

$v_B^2-v_A^2=2gh\\v_B=\sqrt{2*100+100}$

$v_B=10\sqrt{3} m/s\\ E_{C_B}=\frac{0.2+300}{2}=0.1+ 150=150.1J$