1. A sailboat is sailing in a straight line with a velocity of 10 m/s. Then at time =0s, a stiff wind blows causing the sailboat to accelerate as seen in the diagram below. What is the velocity of the sailboat after the wind has blown for 9 seconds? a (m/s>) 4 3 N 1 t (s) 1 2 3 4 5 6 7 8 9 Downloaded from https://www.khanacademy.org/science/ap-physics-1/ap-one-dimensional-motion/average-and-instantaneous-acceleration/a/what- are-velocity-vs-time-graphs2. A windsurfer is traveling along a straight line, and her motion is given by the velocity graph below.Select all of the following statements that are true about the speed and acceleration of the windsurfer. (A) Speed is increasing. (B) Acceleration is increasing. (C) Speed is decreasing. (D) Acceleration is decreasing.