A 1-kg mass is attached to a spring with stiffness 64 N/m.
There is no damping. If the mass is moved 1.5 m to the left of equilibrium
and given an initial rightward velocity of 3 m/sec, determine the
equation of motion of the mass.
Also give its angular frequency, period, natural frequency, amplitude,
and phase angle.
This is free and undamped motion. Solution.