Elastic-no loss of kinetic energy
inelastic-kinetic energy is changed to another kind of energy
Hey, What are the options can’t see anything!
Answer:

Explanation:
You calculate the energy required to break all the bonds in the reactants.
Then you subtract the energy needed to break all the bonds in the products.
2H₂ + O₂ ⟶ 2H-O-H
Bonds: 2H-H 1O=O 4H-O
D/kJ·mol⁻¹: 436 498 464

Answer:
B. Experiments
Explanation:
conducting an experiment is an example of a research method while the other choices are not.
Hope I was able to help you!