Two billiard balls undergo an elastic collision as shown in Figure P7.27. Ball 1 is init...

Two billiard balls undergo an elastic collision as shown in Figure P7.27. Ball 1 is initially traveling along x with a speed of 10 m/s, and ball 2 is at rest. After the collision, ball 1 moves away with a speed of 4.7 m/s at an angle 60°. (a) Find the speed of ball 2 after the collision. (b) What angle does the final velocity of ball 2 make with the x axis?