Question

Placing a 215 g mass on a vertical spring causes a stretch of 5.1 cm. The mass is released at t=0 with y=0.15m (higher than the equilibrium hanging length) with a velocity of v=-1.3 m/s. What is the spring constant of the spring? What is the amplitude of the motion of the mass? Express the height of the mass as a function of time. What is its acceleration when its velocity is 0.8m/s? What is its acceleration when its position is 0.09m?