4. The total mechanical energy in a system consisting of a block of mass 0.55 kg is attached to a spring is 7.00 J. The motion is frictionless and horizontal. The force constant of the spring is 120.0 N/m. a. What is the maximum amplitude of vibration of the spring (e.g., maximum compression or extension from equilibrium)? a. What would be the maximum speed of the block? I a. What is the speed of the mass when it is 10.0 cm from equilibrium? a. What would be the period of this simple harmonic motion