A puck of mass \( 0.40 \text{ kg} \) slides across a horizontal, frictionless surface with a velocity of \( 2.0 \text{ m/s} \) in the negative \( x \)-direction. The puck strikes a force sensor, which records the magnitude of the horizontal force \( F \) as a function of time \( t \), as shown in the graph. The interaction begins at \( t = 0.10 \text{ s} \) and ends at \( t = 0.50 \text{ s} \). What is the velocity of the puck at \( t = 0.50 \text{ s} \)?