What do formulas , arrows and plus signs tell you in a chemical equation

Can somebody explain to me how newton's 3rd law relates to momentum? ~ap physics 1

In the derivation of rrkm theory, a factor of 1/2 is introduced when equalizing the rates of formation and decomposition of activated complex as keal-hr) = ko this is clearly against the assumption of transition state theory that states all the activated complex in the transition state iss going to the product. find the reason why this factor is introduced here.

What is the temperature in degrees celsius of a substance with a tempature of 49k