Suppose a student tried the free fall experiment at home by dropping a ball to the ground and got a velocity vs. time graph as shown below: vertical velocity Vy ( m/s ) O 2.0 3.5 3.0 time (s) -b+ (6pt) Based on the graph, analyze what happened at t-0.5. t-1, t-2.25 in terms of object motion (hint: the ball bounces back). (2pt) Which region (from t = ? to t=?) should the student highlight on the computer to calculate the g and why (more than one correct answer, just give one)