4. Start with Ebefore = Eaer to derive the maximum velocity in a spring SHM system. 5. A 2.0 kg mass is pulled 10.0 cm away from its equilibrium point, on a spring with a 15N/m constant. Show all steps. a) Determine its maximum velocity as it passes through equilibrium. b) Determine the period of the system. 6. Determine the period of a pendulum that is 68 cm long with an 8.0 kg bob on the end. Show all steps