1. A bird flies 70 m [N] in 12 s, then 65 m [W] in 13 s, and then 25 m [S] in 7.5 s. It then returns to the starting point in 38 s. Draw a sketch of the displacements. (a) Calculate the bird's average speed for the entire trip. (b) Calculate the bird's average velocity for the return trip. (c) Calculate the bird's average velocity for the entire trip