The following second-order linear differential equations model the vibrations of a spring-mass system: Equation (1): 49 𝑦 ″ + 42 𝑦 ′ + 9 𝑦 = 0 Equation (2): 16 𝑦 ″ + 9 𝑦 = 0 Equation (3): 10 𝑦 ″ + 37 𝑦 ′ + 7 𝑦 = 0 Equation (4): 𝑦 ″ + 6 𝑦 ′ + 58 𝑦 = 0 The motion of the spring modeled by Equation (1) is classified as [ Select ] an overdamped motion a simple harmonic motion. an underdamped motion. a critically damped motion . The motion of the spring modeled by Equation (2) is classified as [ Select ] a critically damped motion an overdamped motion a simple harmonic motion an underdamped motion . The motion of the spring modeled by Equation (3) is classified as [ Select ] a simple harmonic motion an overdamped motion a critically damped motion an underdamped motion . The motion of the spring modeled by Equation (4) is classified as [ Select ] an underdamped motion an overdamped motion a simple harmonic motion a critically damped motion .    多重下拉选择题