Spring-mass system T = 2 π √( m/C) T in sm in kgC in N/m Example An object is attached to a spring and is vibrating C = 10 N/m T = 2.0 s Calculate the mass of the object 2.0 = 2 π √(m/10) 0.318 = √(m/10) 0.1013 = m/10 m = 1.0 kg