The mass of a pigeon hawk is twice that of the pigeons it hunts. Suppose a pigeon is gliding north at a speed of Up = 18.0 m/s when a hawk swoops down, grabs the pigeon, and flies off, as shown in the figure. The hawk was flying north at a speed of UH = 37.5 m/s, at an angle 0 = 45 below the horizontal at the instant of the attack. What is the birds' final speed or just after the attack? Uf = m/s What is the angle Of below the horizontal of the final velocity vector of the birds just after the attack