Block A is sliding across a horizontal and frictionless surface when it collides with block B as shown in the figure. Block B is attached to a massless string of length L = 0.9 m and is free to rotate as a pendulum. The speed of block A after the collision is half its speed before the collision. Block B was at rest before the collision. The mass of block A is 4.9 kg and the mass of block B is 2.3 kg. What is the minimum initial speed (in m/s) that block A must have for block B to swing through a complete vertical circle? Vo A B A Type your