A mass on a spring is moving in SHM. If it has velocities of 6.0 cm/s and 1.0 cm/s when it is at positions 4.0 cm and 5.0 cm respectively from the equilibrium position the period of oscillation is A. 3.2 s. B. 3.9 s. C. 2.0 s. D. 4.4 s. E. 4.1 s.