二、計算題:(A. Damped Simple Harmonic Oscillation: [6%] A car's suspension system acts like a damped simple harmonic oscillating system. The damped mass-spring system is with mass m=100 kg and the spring constant k=50 N/m. A car's shock absorber system provides a damping constant b=200 kg/s. If the car hits an accident, how many oscillations will it make before the amplitude drops to half its initial value?