[tex]\vec{v_r}=\vec{v_p}-\vec{v_1}\\tg\alpha=\frac{v_1}{v_p}=>v_1=v_ptg\alpha=12*\frac{\sqrt3}{3}=4*1,73=6,92m/s\\v_1=v_o+at<=>6,92=0+40a=>a=\frac{6,92}{40}=0,173 m/s^2\\d=v_ot+\frac{at^2}{2}=0*40+\frac{0,173*40^2}{2}=0+\frac{0,173*1600}{2}=800*0,173=138,4 m\\[/tex]
