The linear elastic spring with stiffness k and unstretched length ℓu is attached to both t...

The linear elastic spring with stiffness k and unstretched length ℓu is attached to both the vertical wall and the metal block A of mass mA. The metal block B is pushed into A so that the spring compresses a distance d. The block B is then released from rest.

Assuming that friction between the blocks and the horizontal surface is negligible, determine the distance the blocks slide before they separate and their speed at separation. Hint: The blocks will start to separate when the normal force between them goes to zero.

Figure P3.123