I’m working on a Engineering question and need guidance to help me study.

Q: A mass weighing 24 pounds, attached to the end of a spring, stretches it 4 inches. Initially, the mass is released from rest from a point 3 inches above the equilibrium position. Find the equation of motion.

* I attached the solution. All you need to do is writing it using your own words (explanation). Try not to copy from the screenshots, please.

Paper should include a cover page, brief abstract, problem with solution and an explanation of the solution (2 pages), and references.