In which diagram would the block of wood have the greatest acceleration?

The answer is B.

Explanation:

There is more Newton force pushing it and since it's on a flat surface it moves more than a higher kg weight block.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.