When a piece of burning magnesium ribbonis inserted in the jar filled with oxygen gas

Magnesium burns in presence of carbon dioxide because, the oxygen in the carbon dioxide is able to bond with magnesium and produce an oxide. Carbon is formed as a biproduct the carbon which is formed is in the form of soot. Burning or Mg in CO2 forms Magnesium oxides.

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.