Reacționează 40g HCl de concentrație 36,5% cu 20g soluție hidroxid de calciu de concentrație 37%(Se dau masele atomice H=1;Cl=35,5;Ca=40;O=16).Substanța în exces este:

answer; /// i do believe that the correct answer is (c)nuclear bond

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)