The arm AB can rotate freely about the pin at A. The spring with stiffness k = 500N/m is d...

The arm AB can rotate freely about the pin at A. The spring with stiffness k = 500N/m is designed so that the system is in static equilibrium when θ = 0°. Let L = 18.2 cm, h = 24.6 cm, and the mass of the ball B be 5kg. Neglect the mass of arm AB. Hint: Sketch an FBD of the ball and the arm together.

If the arm AB is released from rest when θ = −90° such that it swings to the left, determine the speed of the ball B when the arm reaches θ = 0°.

Figure P4.55