A piston in a reciprocating engine undergoes simple harmonic motion with an amplitude of 0.25 m and a period of 0.20π s0.20\pi\text{ s}0.20π s. What is the speed of the piston when its displacement from the equilibrium position is 0.15 m?
1.0 m s−11.0\text{ m s}^{-1}1.0 m s−1
2.0 m s−12.0\text{ m s}^{-1}2.0 m s−1
2.5 m s−12.5\text{ m s}^{-1}2.5 m s−1
2.9 m s−12.9\text{ m s}^{-1}2.9 m s−1
