https://www.khanacademy.org/science/up-science-grade-6-revision-course-full-term/x017c12e57b64cfa8:week-1/x017c12e57b64cfa8:changes-in-neigbourhood/e/energy-required-during-changes 2026-02-26T09:10:46.921543588Z Energy required during changes Let's see how energy is involved in different types of changes. Revathi exercise