Problem 10 A mini-wrecking ball of mass mi = 0.5 kg is released from a horizontal position and swings on a string into a stationary brick of mass my = 2.5 kg, performing a purely elastic collision, as shown below. What angle 0 will the ball swing back to after the collision? The length of the string is /=70 cm. Assume zero losses. String 1 Initial position M2 Final position