The steady state sinusoidal motion, x(t), of a mechanical system is shown below. Note, an amplification factor of 103 is applied to the y-axis. x 10 -3 0 0.1 0.2 0.3 0.4 0.5 Time (s) 0.6 0.7 0.8 0.9 1 Determine an expression that can be used to describe the system's velocity and place your answer below. Indicate the appropriate units.