Refer to the following chemical equation to answer this question.
what needs to be done to balance this equation?
a. remove coefficient 2 in front of h2o on the right side of the equation
b. do nothing (equation is balanced).
c. add coefficient 2 to o2 on the left side of the equation.
d. change o2 to 04 on the left side of the equation.

Base on my research is that in order to balance an equation, you need to make sure that both the reactant and the product of the equation is equal. So base on the problem the product has dihydrogen monoxide. So to make sure this equation to be in balanced you need to add coefficients 2 to the oxygen to make it dioxygen on the left side. The balanced equation is now CH4 + 2O2 = CO2 + 2H2O

The answer is frictional force

This is kenetic energy.