Vectors in Physics?

Question

At one instant a bicyclist is 70 m due east of a park's flagpole, going due south with a speed of 12 m/s. Then, 20 s later, the cyclist is 35 m due north of the flagpole, going due east with a
speed of 18 m/s. For the cyclist in this 20 s interval, find each of the following.

What are the magnitude and direction of average velocity and average acceleraion?

Answer 1

Compose vector triangle and solve.

Answer 2

Vavg = 3.91 m/s angle = 153.43
aavg = 0.1955 m/s^2 same angle.