A test platform used for calibrating marine seismometers is driven in vertical simple harmonic motion. The platform oscillates with an amplitude of 1.30 m and a period of 0.8π s0.8\pi\text{ s}0.8π s.
What is the magnitude of the velocity of the platform when its displacement from its equilibrium position is 0.50 m?
1.5 m s−11.5\text{ m s}^{-1}1.5 m s−1
2.0 m s−12.0\text{ m s}^{-1}2.0 m s−1
3.0 m s−13.0\text{ m s}^{-1}3.0 m s−1
3.3 m s−13.3\text{ m s}^{-1}3.3 m s−1
