A player bounces a 0.34-{rm kg} soccer ball off her head, changing the velocity of the ball from initial velocity = (9.6 m/s){{hat x}} + ( -2 m/s){{hat y}}
to final velocity= (6.4 m/s){{hat x}} + (5.5 m/s){{hat y}}.
If the ball is in contact with the player's head for 6.7 {rm ms}, what is the direction of the impulse delivered to the ball?