If a car goes from being at rest to 20 mph in 5 seconds, what is its acceleration? *
3 miles per second
4 miles per second
5 miles per second
6 miles per second

Which best describes the activation energy of a chemical reaction? a. the combined energy of all the reactants b. the amount of energy required for a reaction to occur c. the difference in energy between products and reactants d. the potential energy stored in the bonds of reactants and products